Based on what creators I watch on youtube frequently complain about the problem with youtube is less the recommendation algorithm and more the constant changing of rules around how the UX works, with little/no documentation. There's also the seemingly arbitrary demonetization of videos with little to no recourse from creators.

An example: you used to "subscribe" to a youtuber to get notifications about new videos, but then notifications frequently don't happen, then they added the little bell toggle which supposedly controls whether you get notifications or not, but then notifications still don't seem to happen all the time.