“When will UE5 be generally stable?”
I think it will take a long time. One fact remains - that engine is starting to get over their heads.
I don’t want to be a advocate for devil, but when they have a large number of people working on the engine at the same time, there is usually a problem with safe commits. The thing is that while you have fixed something, for example, you are still tied to a previous commit that could have broken something. The only thing that can save them is months with datalock and then fixing the bug. However, I don’t think this is possible until unfinished features are finished 
The commit basically won’t get out soon and there are other factors that can make more (for example Microsoft ). But i just thinking loudly.