I mean, your phone (or at least mine) has Documents, Downloads, Photos etc. just like windows (and linux) have. The Android folder is akin to windows's AppData folder too, there is a lot of overlap in folder structures imo
Understandable tbh. Depending on your phone, there are chances it's actually fairly easy to change ROMs, you could also try stuff out on an older device of yours or your family's
It's been >6years I've dual booted windows alongside Linux. Granted, the windows partition isn't often used; but never has it erased my Linux out of existence
In that case, are you fully doing your bed every time, or just putting the duvet or whatever flat on the mattress so that it's protecting it ?