Improve confusing paragraph. Saying “You’ll end up with input” is confusing and contradictory in this context. Even after this change, I find the first sentence confusing as it isn’t clear what input and output are in this context. I think you need to disambiguate between the idea of input and output and the webpack config settings of input and output (I’ve assumed you mean the latter and therefore have bolded the terms).
replace use of ‘absolutely important’ with ‘very important’ (You could use ‘absolutely crucial’ or ‘absolutely critical’ instead, but ‘absolutely important’ is not right.
Improve explaination of config complexity and explain that the fact the config is written in JS allows it to be broken down in different way (perhaps add a ref to chapter talking about this).