Not sure what you mean by movement meta.
I personally tend to choose more mobile legends (I don't do fancy wall bounces and didn't script zipline / super glide movement either) just because:
1. I play mostly soloq = 99% of games teammates die instantly and I am being chased by more than one person = need to relocate / outrun them
2. given controller player superiority in close range vs me as MNK = I need to be able to create some distance to manage fights to my advantage
3. given most players are lazy to look around = movement / repositioning legends make them stop tracking you / you can easily flank them
4. it is just more fun to play constantly moving given cool mechanics of Apex vs say setting up Wattson fences or Rampart barriers and be totally predictable and stationary = it works but only with 2-3stack and when you agree to play like that because all benefit from it e.g. I really like Newcastle and old Caustic was almost my favorite legend to play, but these days you just die as sad as Gibi solo bubble death with those two as your team is unable to teamwork or play stationary.
I don't know why but Respawn / EA has created this thing where movement legends are just better in most cases or you at least need to have 1-2 out of 3 that have it + support / recon / controller based on your game style. Playing like before e.g. Valk Gibi and Caustic is just not viable. IMO also Bang is rendered obsolete despite finally having normal smoke mechanics because more mobile legends can just jump over it / flank instantly and Bang is done for it. Same can be said about many other legends - Seer, Blood, Catalyst, Rampart (unless you lucky to Sheila all 3), Fuse, Gibi, Caustic to certain extent (his gas is still kinda walkable, slow down needs to be added back then he is good).
Movement + unreliable audio = there is just much higher chance to confuse / flank people with that combo vs take straight up predictable fortified fight via above mentioned and try to win that.