I don't think it's ridiculous, it's just they might not necessarily care enough. They will consider it a bug if there's enough uproar, for now there are just a couple of unhappy users here and there, no reasons to revert something that presumably took a lot of work to implement, especially if the fix takes more effort than the original implementation (I wouldn't be surprised since we're talking about performance differences between browser engines).
In the world of fail early, fail often this stuff is bound to happen. That said YouTube works fine for me minus the obvious resolution issues that YouTube has been enforcing forever because of DMCAon some videos
Wish that were true. The world would be a much less buggy place.