Separate from the recommendation problems, which seem to vary by person, the site has gotten substantially worse for mobile players, to the point I've almost entirely stopped using it:

- The mobile page does not allow quality selection, and always selects quality options far below what would be supported by your connection (It sometimes drops to 240p, and I have not seen it select anything above 480p, yet can easily stream 1080p on the desktop site or other players).

- The mobile page does not respect the "Request Desktop Site" option, even in Chrome - and neither does their own "Desktop Site" link; Both still use the abysmal mobile player, and only by enabling both can you use a high-quality video player.

- Anything 60fps has issues on my mobile device, while other web players are fine - even 720p60 lags, while I can stream 1080p60 elsewhere.

I uninstalled the app years ago when it requested additional permissions with an update, and implemented a 30-second delay (with countdown!) before launching until I updated. YouTube is no longer the pinnacle of web video, and have not been for years.