The homogenity complaints are in part due to the fact that every single job is a "build gauge to spend during burst" job now. Yes, they have some flavor differences, and the way the burst builds can be different, but overall the goal is always the same.
It's a complaint because it *wasn't like that* before. There were tangible differences, such as BRD being defined by snapshotting crit buffs onto DoTs to gain rapid big attacks while providing a continuous buff cycle and acting as an MP/TP battery to the rest of the party.
Now, BRD simply builds up gauge to release it. Sure, it's technically different from its peers, but every job is effectively "filler until everyone releases together" and if you don't like that type of gameplay, well, there's really no job left that *isn't* designed in the same "build gauge to burst" style by this point.
What drove it home for me was during leveling in Dawntrail, I decided to actually set up my hotbars and as it turned out, I picked up every job pretty quickly and efficiently simply because I understood that they were all about the same thing. I build gauge, I spend for big damage. You do it on tanks, you do it on dps, and you do it on healers too.