There's more to it than that. A lot of people will also say meta doesn't matter if you aren't a top group. Well.
I mean, suppose you (theoetical 'you') are a crappy bard. You still benefit from nin+drg melees (and further from the mch vuln up too). You don't need to be a top end speedkiller in a high end static. Even if a person is average or bad, they can still take advantage of and benefit from synergies.
So yeah, "well your job isn't incapable of clearing content" isn't much consolation when no one wants you around anyways, or everyone tolerates you but really wishes you'd switch to that other job, and they'd get a better fflogs ranking if only you would...