Every time I view one I think to myself "I really should make a userscript that changes the '/short/' to '/v/' in the url" but I never view them often enough that this annoyance has manifested itself in action.
Agreed. It's like a different video playing application popped up in the middle of YouTube. Also weird when you exits shorts, the previously watched long video starts playing.
The Youtube app (on android at least) now lets you use more of the normal controls (particularly seeking and adding to playlists) on shorts as of a few months ago. I thought the lack of those controls was intentionally permanent but I was relieved to find out it wasn't.