That’s a separate issue. The bugs on AdBlock And AdBlock Plus extensions affect not only YouTube but other websites as well (as said by uBO dev). This isn’t on google but the extensions themselves.
X is old and works for the most part but fixing stuff or adding features is hard.
Wayland is new and is supposed to be a successor to X, do what it couldn’t do and don’t repeat the mistakes from it. It should be a drop-in replacement like pipewire but isn’t. Features take long time to develop as devs are engrossed thinking of the best solution to make it happen. A lot of proposed solutions are dismissed as well.