Pressing back button when on the "home" screen of Stremio instantly exits Stremio. It is very unusual for Android TV applications to behave that way, because it prevents the user from easily "spamming the back button quickly until they're at the home screen of the app again". The user has to very slooooooooooooooooooooowly press one time... and then another... and then another.... and then they have to guess whether they are far back enough that navigation will work as in the "home" state, and try the arrow keys to check if they have press back enough times, and a single accidental extra press of Back kills Stremio... Painful.
The instant exit without confirmation is very disruptive. Less technical family members are having lots of trouble with it.
Improved behavior alternative 1 (this is how applications like Netflix and Kodi do it):
Pressing back button simply doesn't exit Stremio at all. It just navigates backwards until the Home screen and then stops. No risk of accidents.
Netflix, Kodi and most other applications pick this solution.
To exit, the user has to use their Home button on the remote control, instead of the Back button. It's a very logical solution.
Improved behavior alternative 2 (this is how the very popular "TiviMate" media application does it):
Pressing back button on the Home screen shows a small message on screen, saying "Press back again to exit Stremio."
When the message is presented, instantly ignore the next 0.3-0.5 seconds of "Back" button presses to avoid reacting to a user who is trying to quickly get Home by queueing up a bunch of Back presses.
Next, wait for about 1 second to see if the user presses Back again.
If the user doesn't press back within 1 second of the message, hide the message.
This solution is pretty annoying as a user, but I just mention it since TiviMate uses it.
Current behavior:
Improved behavior alternative 1 (this is how applications like Netflix and Kodi do it):
Improved behavior alternative 2 (this is how the very popular "TiviMate" media application does it):