It is important to remember that most users are not heavily technical and will expect to just get an answer when they come here, rather than being sent somewhere else. To them, they are on elementary OS, and this site is where they get help for it.
And that is okay.
My suggestion is as follows:
If it is a simple question regarding installing/running the ...
Personally, I feel like they should be off-topic. I don't think we can be expected to be experts on 3rd party software. It seems to just lead to a situation where we have a lot of un-answered questions.
I agree with the issue but not the solution. The point remains that we are unequipped to help, especially in a Q&A format, when the issue is a bug and not something we can address. The obvious solution is that we need better triage and handling of incoming requests such that bug reports go straight to Launchpad rather than us... but that's an issue of ...
I disagree. There's nothing that can be done on StackExchange to close the report. If something is a bug, it needs to be reported in Launchpad where developers can see it. If developers never hear about the issue, it won't be fixed.
If there's a bunch of just unanswered open questions in StackExchange with no resolution, it makes it harder for people to ...
As far as elementary is concerned, feature requests and bug reports are the same thing. They should both be reported in GitHub following the same guidelines.
Also, this is Meta. Questions here should be about the elementary OS Stack Exchange ;)