You're right that this behaviour is bad and I know that what you describe happens but it seems like a strawman argument in the context of this discussion.
What you describe is about the community respecting foss maintainers; closing tickets is not going to solve this problem.
I was responding to the point about comments piling on a closed issue. It is not bad by default, but still there can be valid reasons for maintainers to discourage it.
Whether an issue should be closed or should be allowed to be re-opened by the public is not even up to debate as far as I’m concerned, this is up to maintainer’s policy.
What you describe is about the community respecting foss maintainers; closing tickets is not going to solve this problem.