You may see people suggesting you to limit your battery charge to 50%. Here I will go over why this is suggested.
NOTE: I in no way claim that the information presented below is accurate. I try to state my sources and reasonings and even go over what I am guessing on. Don't take my word for it; try to do your own research as well. Please feel free to add any more information. But at the end of the day, don't lose sleep over this.
Why would I want to limit my laptop's charge?
Apple says should be the charge batteries are stored at. If you are using your laptop off of AC power all the time, then you are effectively storing the battery, so this is a good charge to limit your battery to.
In reality you aren't "storing" the battery; the battery is still being somewhat used no matter what your charge is limited to. It's a necessity with how Macs (and presumably many other types of laptops) work. Some older laptops don't work this way I believe, but they may not have the same power requirements. Don't worry about this. This will happen and there's no way for you to stop it.
So, the battery is being perpetually used... does this mean limiting charge is useless? No. It's quite evident from the Battery University article that keeping a Li-ion battery at 50% perpetually is better than keeping it at 100% perpetually, by quite a long amount.
Limiting to 50% vs 80%
The common percentages to limit battery charge are 50% and 80%. 50% is the best because of reasons I can't really explain, but it has to do with it being some sort of middle ground for batteries. However, it's kind of inconvenient if you want to disconnect your laptop. That's why people usually opt for 80%, as this gives good lifetime. I'd suggest going with 80% for most people.
Limiting charge vs Apple's battery health management feature in Catalina
From my experience, Apple's management feature cycles the battery from 90-100% daily when it thinks that you won't be using your laptop on battery power. Is this better or worse than limiting your charge?
I strongly believe it's not as good as limiting your charge. Apple did this because of convenience. Think about it: the battery only goes to 90% for 5% of the day, when you're not using it on battery power anyway. This is much more convenient than limiting your maximum charge level, and that's why Apple chose to do it this way.
I believe that this helps your battery—I trust Apple's judgement here (and it would be kind of stupid to believe otherwise. Please no conspiracy theories, thanks). However, because of the above reason, I believe that this isn't as good as limiting your charge.
However, I would nonetheless recommend Apple's feature for the general user. That's why it's enabled by default on macOS 10.15.5+.
An argument against battery management: battery temperature and age are the biggest factors for battery degradation
If the temperature you store your battery at is bad, and your battery is old, both of these will likely have a greater effect on battery health than limiting your charge. This is why it's usually not worth it babying your battery and not enjoying it to its fullest—it will deteriorate anyway.
This is the argument that most anti-battery management people use on the internet. I can not 100% verify these claims; however, that does not mean that they are false—I just haven't looked into it that much.
You may see people suggesting you to limit your battery charge to 50%. Here I will go over why this is suggested.
NOTE: I in no way claim that the information presented below is accurate. I try to state my sources and reasonings and even go over what I am guessing on. Don't take my word for it; try to do your own research as well. Please feel free to add any more information. But at the end of the day, don't lose sleep over this.
Why would I want to limit my laptop's charge?
Apple says should be the charge batteries are stored at. If you are using your laptop off of AC power all the time, then you are effectively storing the battery, so this is a good charge to limit your battery to.
In reality you aren't "storing" the battery; the battery is still being somewhat used no matter what your charge is limited to. It's a necessity with how Macs (and presumably many other types of laptops) work. Some older laptops don't work this way I believe, but they may not have the same power requirements. Don't worry about this. This will happen and there's no way for you to stop it.
So, the battery is being perpetually used... does this mean limiting charge is useless? No. It's quite evident from the Battery University article that keeping a Li-ion battery at 50% perpetually is better than keeping it at 100% perpetually, by quite a long amount.
Limiting to 50% vs 80%
The common percentages to limit battery charge are 50% and 80%. 50% is the best because of reasons I can't really explain, but it has to do with it being some sort of middle ground for batteries. However, it's kind of inconvenient if you want to disconnect your laptop. That's why people usually opt for 80%, as this gives good lifetime. I'd suggest going with 80% for most people.
Limiting charge vs Apple's battery health management feature in Catalina
From my experience, Apple's management feature cycles the battery from 90-100% daily when it thinks that you won't be using your laptop on battery power. Is this better or worse than limiting your charge?
I strongly believe it's not as good as limiting your charge. Apple did this because of convenience. Think about it: the battery only goes to 90% for 5% of the day, when you're not using it on battery power anyway. This is much more convenient than limiting your maximum charge level, and that's why Apple chose to do it this way.
I believe that this helps your battery—I trust Apple's judgement here (and it would be kind of stupid to believe otherwise. Please no conspiracy theories, thanks). However, because of the above reason, I believe that this isn't as good as limiting your charge.
However, I would nonetheless recommend Apple's feature for the general user. That's why it's enabled by default on macOS 10.15.5+.
An argument against battery management: battery temperature and age are the biggest factors for battery degradation
If the temperature you store your battery at is bad, and your battery is old, both of these will likely have a greater effect on battery health than limiting your charge. This is why it's usually not worth it babying your battery and not enjoying it to its fullest—it will deteriorate anyway.
This is the argument that most anti-battery management people use on the internet. I can not 100% verify these claims; however, that does not mean that they are false—I just haven't looked into it that much.