The question Should an answer like remove Ubuntu and install Slackware be flagged? arose myself while answering Let's not do “I don't know how to fix your problem, so just reinstall", so I decided to ask it as a separate question.

I have searched for similar questions and found this one: Should I flag answers which only suggest “install a different OS”? (which is quite the same question indeed), but (1) it did not attract much attention and (2) it is 2 years old, so community opinion may have changed since then (that's why I'm asking it again instead of resurrecting the old one).

The opinion I got after reading it is "Don't flag, it is a legit answer" (though it derived to "[...] install a different desktop environment").

Additionally, questions about unofficial derivatives are close to the thin off-topic line.

So, recalling, should an answer like remove Ubuntu and install (insert distro here) be flagged provided it has been proven it solves (or may solve) the problem and the cause is bound to be Ubuntu-specific?