Rhythm style button press from PSO2, holy I feel old now. (they got rid of it with New Genesis so it's only a holdover in the legacy version)

The thing is, we already sorta have this - it's the global cooldown and riding OGCD cooldowns, it's simply optimal in most cases. In comparison, PSO2 Photon Arts also generally had no cooldown and were only gated by the resource "Photon Points", that's why it sorta worked. There is also the fact that PSO2 runs on UDP connection (meaning your latency to hit targets in PVE is fairly lenient) where-as FFXIV works on TCP connection to my knowledge, which requires a lot of back and forth for even just seeing your resources update.

Maybe with 8.0 when a whole overhaul of the role could be considered.

Movement might also currently be overrated a bit. It's absolutely interesting, but "for what".