How is black mage 'non-competitive' in the current patch, pray tell? Objectively speaking, it remains the #1 rdps job in the game which you can check for yourself right now. It's just 'only' 500-1000 dps ahead of summoner now, instead of 1000-1500. On e2, e3, and e4 you have to scroll down to almost the hundredth place, past a ton of blms, mnks, and sams, before you see the first summoner appear. E1 is the only outlier fight where they share the top of the leaderboard with blm, and that's because of padding with bane and phoenix gcds on the quad meteor orbs, and a killtime where the fight ends immediately after that.

If you're in a group that intends to do speedruns, blm isn't going anywhere. If smn enters the metagame for speed, it will be by replacing a melee or a range long before they enroach on blm.

If it's about being welcome in progression, I've already explained a few pages ago (here) why summoner is not the reason for black mage being shunned from groups. The real reason is outdated stereotypes about raid comps that assume having 2 melees is the 'standard' and that the 3 casters have to fight for 1 raid spot. Blm already does more rdps than any of the melees, a second addle is more than a fine replacement for feint (better even, since raids tend to skew magic heavy). We are no longer shackled to drg for ranged buffs, or nin for emnity control.

Tell me, what reason is there for a group to not replace a melee with a good blm? Thinking this is about rdm/smn vs blm alone is buying into a false dichotomy.

You will never be able to force people to willingly take a blm to prog by nerfing summoner and red mage. In the first place, trying to tear down your 'competition' is a lazy and underhanded approach. The sooner you realize it's the melees you need to justify your raid spot over, the better it will be.

There are a few other reasons I can venture as to why stereotypes about black mages have been slow to change, and they aren't commonly picked for groups. For one, it's hard to find good black mages because of how punishing mistakes are to their output. Due to their gameplay they also encourage (or attract) players that tend to be greedy at the cost of safety - not a good mindset to have in progression. And so what? All these are personal problems that have nothing to do with the other casters. If you insist on playing the all star quarterback dps role for your group, you had better be prepared to fill those boots because it is your responsibility to get good.