I think it's Naive to say that it's a community problem, it's highly unlikely that these same sheep claiming RDM and BLM are useless are doing the hard numbers for that information, they're just vomiting what the better players told them and couple that with the fact that SE doesn't always make their balancing decisions and the state of job direction tangible. Players will naturally leech onto what they're told. The solution would be the same as what caused the problem, But memes like DeleteMNK/SAM only make the problem worse.
Even if these advantages aren't applicable to 99% of the community, it's rare that players will turn down any sort of advantage they could get. the only thing stopping RDM is the fact that SMN is generally viewed as better all around and thus RDM will (not always) be overlooked in favor of a SMN.
Just because you think in your opinion that players should ignore meta unless they're at the 99%, doesn't mean thats how they will act. Yes every job can clear content, every job is great in great hands. nobody will discredit that.