Not sure what exactly you meant, but Black mesa was mighty playable and 100% stable when it was released as full. Maybe stay away from half-working early builds of these kind of games, IMHO its not worth the frustration just because of some nostalgia.

Now if somebody would port first Deux ex into Unreal 5.2 engine that would get me interested (but still, keep your emotions in check and play when its ready, otherwise just a recipe for regrets)