By the pointtime they earn that privilege, I think most of those people are familiar with what that amounts to: We can close these at our discretion. For me, that possibility exists when it is clear that the question does not require any knowledge of the Raspberry Pi to answer. That's not sufficient in itself, eg. if it is something I can answer easily enough and I have a few minutes, I'll do that -- which of course doesn't mean that someone(s) else (and sometimes even myself, which may seem strange) can't close it, of course.
ThisSetting aside the fact that a closed question always includes an explanation in the form of the stock blurb (because it is certainly not clear, because it is off-topic, etc), this is a phenomenon unique to us; itthat is part and parcel of the system we do not control. I would happily support a change such that the first close vote cast, at least, should require a comment from the caster. However, this has been debated at Meta.SE repeatedly and the contest is not close: The largeclear majority of users who participate in such debates are against thatit. As with this, anyone is of course welcome to try again and see how much support they can drum up for it.
"is it time to re-evaluate answering Linux and Pi questions here and maybe remove the hard 'off-topic' to a reserve the right to ask the user to ask in another forum?" Is really a non-question: For starters, it is already the case that closing a question as off-topic should usually be accompanied by a recommendation to another site. That it isn't always is because the system doesn't force people to leave a comment when they vote to close and there is nothing we can do about that (discussed above briefly).
Worth mentioning at that point that our specific community is often not considered a particularly friendly one by, eg., people coming here with experience elsewhere on SE, and it is not simply because we close some questions as off-topic. I do think we need to work on that (niceness), and although I am currently at a loss as to how to help effect it, I do not believe it is by saying we willpromising to do more for more people when it is already debatable how good a job we are doing nowis an appropriate step in that direction.
If we had a friendly, more helpful site, I think that the people who close the gray area questions would be less inclined to do so. Right now, the idea that letting them fester or gather bad answers and RTFM comments instead would be better does not make sense.