I don't disagree with you about fight design, but it's a lot easier to just nerf PCT rather than rewind encounter design to three expansions ago.
Also you're just kinda wrong about DT BLM. The job isn't any burstier than in EW, because all of its damage is still on the GCD. And since nonstandard is less accessible now, manipulating your GCD alignment is harder, which means that for 99% of BLM players the proper play is to still ignore buffs and just keep on casting.
I think EW BLM was the best compromise the job had with modern fight design, which for some reason SE decided to completely delete from the game to make a job that IS LESS FLEXIBLE and therefore more susceptible to disruption in the form of extended movement, short uptime phases, etc.