Well it's a matter of perspective for sure. If you take EW BLM, you have a crazy amount of uptime tools and instant casts compared to older BLM versions, but you also need a lot more of them as well, so it makes perfect sense that they'd still feel limited within that context. So it mostly boils down in the amount of the kit and gameplay dedicated to DDR vs other things. I'm not a BLM main so ultimately it's up to casters to decide what they want, but I've had the debate a lot recently within the rphys role as well and it shows the divide between veteran players and newer players as clear as day, the same way it does here. They've changed the game slowly but surely enough that it created two types of populations that aren't playing for the same reason. Unfortunately for me, it's not my type of audience that the game caters to and moves toward, so people that are completely into uptime shenanigans with heavy spreadsheet planning per fight are obviously going to be more pleased than the others.
Minimizing movement was definitely part of the core identity of older caster models, it's just that it was less of a central and primary part than it is today. Melee DPS on the other hand, have always had to deal with heavy uptime concerns and back then they had a lot more positionals and missing them was a lot more punishing (before SB, it could break combos or not trigger certain effects). But if anything, melee DPS gameplay has been slowly occupying all the space and spreading to every other role because that's the type of gameplay encounter SE has chosen to keep while removing everything else, so it makes sense that in order to follow, casters also need to constantly get more and more to keep up. It definitely generates a lot of gameplay around uptime though, I'm not saying this is a lesser type of gameplay, but this is a shift in focus and spread.
BLM if anything has been the caster the least affected by this gradual change and before DT was still referred to as the sole job that's still living in designs of the past. But, like you say, I do not think BLM is changing in order to adjust to the super heavy DDR meta gameplay we have right now, because it's no different from EW. At best you could argue this for that despair change and the third polyglot for sure, but most of the core changes it has had for DT like Flare Star, MP, and everything that made the rotation a lot more rigid and less freeform is not tied to uptime at all, it's just tied to SE trying to streamline it and ensure that people do play it the way they want it to be played under the guise of making it more straightforward.