[justsomehnguy]

  https://www.youtube.com/shorts/KaSmgzaKgYM

and

  https://www.youtube.com/v/KaSmgzaKgYM

are the same, so at least you can use some redirection extensions to always show you the full interface.

Or use something like 'Simple Blocker' (FF) which would just block everything which includes `youtube.com/shorts/` in the URL.