I finally broke wasting hours on YouTube shorts (and youtube in general) by turning off the watch history on my account [1]. It completely removes all videos from the "homepage" (including shorts from the sidebar). There are still shorts in the subscriptions page, but I think this is an acceptable tradeoff. YouTube for me now has just become who I'm subscribed to, which is a much more pleasant experience - there's an "end" where I'm finally caught up and can move on to doing something else. This is also for my entire account, so it's not something I can just disable from my browser bar or that won't work on mobile. I don't need to remember to set it up on a new device either.

[1]: https://support.google.com/youtube/answer/95725?hl=en&co=GEN...