Stack Overflow has a whole lot of questions asked (and answered) in such a way to be hopelessly too specific to the asker’s problem or just another copy of an endlessly duplicated question, meaning they’re not helpful to anyone else. There are also more than enough people perfectly happy to provide a direct answer to such questions instead of trying to provide a more general answer or close or edit the questions. This is perhaps my biggest problem with the site and it’s (from my point of view) causing a lot of conflict and frustration all around.
Of course helping askers and building a repository aren’t mutually exclusive. There are many cases where actions benefit both (which is great), but there are also plenty of cases where you need to choose one at the cost of the other. And these choices define whether you’re more welcoming or higher quality.
This is addressed here and summarised in this older post (and some of the other answers there).
Would there be any change in terms of this (e.g. attempting to minimise the number of such questions) on this site?
Improved tools was mentioned in the post above, but it might be more important to consider the incentives for answering and moderation (i.e. closing and review), and perhaps also how easy it is to publicly post a question in the first place (e.g. send a question to review before it goes public). There has many other suggestions on Meta SO over the years, but I can’t recall that many of them right now.