Job discrimination in this game is nothing new. I'd like to remind y'all of when, prior to the last major patch with its better gear and echo buff on primal fights, the melee dps were being left out of Garuda Ex because of the double wicked wheels, or BLMs unwanted in Titan Ex or Ifrit Ex because of the movement and dps cuts they suffer there.
The argument that one can simply play a different job is a fallacy. Because, yes, it's easy to level up any job to 50. But, no, it's very time-consuming to gear them properly for endgame content like Extreme Primals and Coil.
It's an oversight to design content in a way that it marginalizes or renders jobs useless, to which they can either decide to re-tune said content, or re-balance said jobs. They decided that the content works for everybody else and they are happy with making things mostly single-boss-slugging hyper-dodge-fests, so they apparently decided that BLM is the one that needs re-tuning, not the content.
Arguably, they'd otherwise have to try re-tuning that content so BLM are suddenly more useful, while straddling the thin line of not making it so a party would not want to ever go without a BLM no matter their specific approach to the duty. By that logic, it would make sense to improve their single-target dps output and/or mobility while taking their AoE powers down a few notches in turn. So, coming full circle to the WAR argument: I don't know anybody who thought that WAR was better the way it was before 2.1. It was definitely more interesting, but always felt like a massive liability in Coil and due to that, was a no-go for a lot of parties there. Now look at WAR's role in Coil; not only accepted, but often desired in tandem with a PLD—IMHO, that sounds a lot more like the way it should be.