Some stack exchange users might not like feeling like they've done something wrong on Stack Exchange and can't doing anything without wondering if they're going to do something wrong and hate that. Maybe there's a way for people to teach them by writing comments without making them feel that way. For example, giving somebody an indefinite question ban might not be worth it because it might make them feel that way even if it's better for the network and instead, after they've been shown to be asking a lot of not very good questions, just get a 21 day question limit and after they ask another question after they get a chance, get a 21 day question limit again and if the question turns out to be good, have the limit end sooner. Also, we can never be sure they aren't going to learn how to ask more good questions than bad questions. Maybe they could also be told that nobody has an obligation to contribute to the network so it's not that bad to have been made unable to by a block and they didn't do anything wrong but other hard workers did the hard work for them of figuring out how to decide when to block so that they will worry less about making sure they don't write any inaccurate answers because they can get blocked preventing more of them. For me personally, I think it would be better if it worked in such a way that when I'm at my question limit, the probability density of my limit ending remains constant at 1/21 days and I didn't find out when it was going to end until after it ends because that way, I'll see that my experience is all the same to me regardless of how soon my limit is going to end and learn how to enjoy the time before my limit ends and focus on the fact that a goal I previously set of asking another question and seeing if it ends up good has already been done instead of impatiently waiting for it to end and if it's a fixed 21 days and every time I ask a question, I reach my limit, then I will set a new goal of that limit ending and by the time I'm near the end of my life which is probably more than 50 years away, I won't be ready to die before my goal gets done.
For people who are frequently sometimes giving answer with wrong information, maybe they could get an indefinite ban but still have the ability to post a pending answer, and other people could waste less time by marking ones they're not sure are worth keeping as undecided than by blocking them from writing a pending answer in the first place because they insist on doing the research to not reject one that's worthy of keeping, but once in a while, they could review a pending answer of theirs more carefully and approve it if it's worthy of keeping. However for any user, probably very little of any information they ever learned they know for certain is true and it's not worth them write so few answers in the first place because of that. For that reason, researchers themselves should decide it's their job to do their own research and not be so sure that information they read in a Stack Exchange answer or information they got from a web page after Googling is true just because that web page said so when they can't verify another way that it's true.
Also, I find it annoying that I don't get notified when an answer or question I wrote gets deleted. It means me slower to learn whether a question or answer I wrote belongs. Also, if somebody tries to help me learn my writing a comment to a question or answer I wrote and then I don't check Stack Exchange after it gets written and before my question or answer gets deleted, I might miss seeing the comment. If I at least got notified that a question or answer I wrote got deleted, then I could go to the question page and see if a comment was written on it. Also, nobody can teach somebody else a method that tells them how to figure out for certain whether a question or answer is fine to write in a certain way so maybe when somebody tries to teach somebody else by writing a comment, they could be aware that they're just saying what's probably true and not what they know is true and the person they wrote to is free to write back and discuss why they think it might not be true. For me, being given that type of comment is better than being given no comment. Also, they could write a comment and be clear that it is a suggestion and not an order and the person is just meant to do their best so that the other person can make an effort to improve the site by the way they write questions and answer but not feel guilt for not doing a better job of it than they can and instead be like "Seven" from the movie "Gifted" who got interested in solving the "Navier-Stokes existence and smoothness" problem but didn't get stressed over wondering if she couldn't do it.