Server maintenance doesn't mean that they're working on bugs, most of the time they can work on them without taking down the server. Server maintenance means they're optimizing the server or fixing some issues multiplayer related. We should all head over to the official forums and state our problems there; I'm not saying this isn't the correct place but the main forum would be better because that's the first place they look into.
Yeah I think bug fixes are usually sent during updates so I don't expect any changes until updates come generally. I have heard devs say something like a type of update they send without having to ask people to download a new patch but I forgot the term, but yeah it's different from server maintenance.
You've said it yourself, it's aserver maintenance, not a game fix at all. They probably are not going to fix it ever since they don't really care about taht anymore.
While I take your point that they may not be that bothered about fixing t, I think to say they have stopped caring is slightly harsh, haha. Server maintenance is always going to be needed, no matter what game we are playing so to pick out issues with just one game like others have done is also a little unfair as ell I think. People will complain if they DO maintenance, and complain if they didn't so in a way the game developers can't win and please everyone all of the time.