The latest question of mine "when not to use virtualisation" got closed pretty fast.

The assumption for the close was that it would cause debate/discussion (my guess, after I reviewed the comment about KVM/VMWare) - I would rather have expected "not a real question", since the question is somewhat broad.

Anyway I think the question is still interesting, but I have no really good idea on how to reword it, so that answers will stay on focus without causing discussion.

I welcome any ideas about it - even if the idea is "this is the wrong place to ask that".