No, no, a thousand times no.
This is about amateur brewing. There is going to be a LOT of hearsay, a lot of unscientific anecdotes.
If you add rules about "back it up" and discourage any experience or even hearsay based discussion this site will quickly die. I doubt that there are THAT many scientists on this site.
It is doubly unneeded, if someone makes an outrageous claim, the community will call that person on it or it will get downvoted to death.
This suggestion will create more problems than it solves.
Downvoted to express my opinion.