They're not wrong, and unironically they are the issue when it comes to positionals. SE is making changes to jobs to appeal to people who don't like them and in many cases don't even play them, even though there are plenty of other jobs that lean closer to their requirements. It has not resulted in better jobs overall, and you can say this about every single role in the game. Ask healers how they feel about Shadowbringers. Ask Dark Knights and Warriors.
I think it's worth some measure of concern that when Endwalker comes around, SE is going to continue the trend of removing what little complexity there is in the act of playing this game to try and get more people to play different jobs. By itself, wanting more people to try more things isn't a bad idea, but if it comes at the cost of homogenizing the identity of various jobs in a given role, it ultimately serves to keep people in jobs that still lean closer to their preferences. If every Melee DPS played more or less the same outside of their unique job meter, what would be the point of having so many different ones? If all casters focused on instant cast dots like Summoner, what would be the thing that draws people to other jobs? The aesthetic?
This game was and still is at its best when it demands players to play better. If nothing else, things like positionals should not only remain in the game, they should also be the mark of better players, and they should also be considered when balancing high-end boss encounters to force players to engage more with those mechanics. Yes, that means that some players will struggle to get carried through content. That's fine. There's already plenty of content that accommodates them as is. They'll still be able to stand in AoEs during Endwalker's last battle and arrive to the fight's conclusion as a corpse and still get the nice cutscene that tells them their WoL was The Coolest WoL Ever.
I do not agree, whatsoever, with the assertion that the game doesn't 'accommodate' these mechanics, just as I would disagree with a BLM topping the DPS charts whining that encounters don't 'accommodate' cast times and therefore they should all become instacasts.