YouTube does make some kind of changes significantly harder to build than simple scripting will handle though. I do definitely see some reasons for specialized apps, and video is a fairly prime example of where they're often more capable or more (power/time/whatever) efficient.
When I switched over to using an app, there was also a good chance that an algorithmically suggested video from an unfamiliar creator would capture my imagination. When I have looked at recommendations recently, I doubt that would be a problem today. Too much AI and human generated slop. Too many click-bait titles that barely give a hint on what the video is about, never mind why I should care about their take on it.
Then there are the days when I am both bored and exhausted. While I don't tend to watch much on those days, I have known myself to scroll through the recommendations to see if there is anything to occupy the time.