Deleting an app from any device regardless of OS should generally remove all related files, except in cases where the app asks you if you’d like to keep certain files, such as personal data or saved game files. However that’s not to say that they always remove related files, things such as updates can leave files in particular temporary directories, some of these are not always removed as part of the update process and so they are not something which would be recognised during the removal of the application either.
These kind of temporary files and folders being left behind are why there has always been reasons behind creating apps to “boost” you device performance by removing some of these left over junk files but are also the reason that sometimes its better to just totally reset the device, clear everything out and start again.
I know there was a time I would pretty much do this on a yearly basis for my own computer to try and keep it at a close to peak performance level.
It could be a number of things that people have mentioned in here.
Just allow yourself to do what you actually want to do. If you feel like you actually want to watch movies or TV shows then you need to consciously stop picking up your phone.
At the same time, if you only want to watch a movie or TV show because its what you “think” is expected of a “normal” person, stop. Just let yourself lay on the couch/bed and scroll.
We place too many expectations on ourselves these days to be doing certain things, instead of just doing the things we actually want.