Over the years the devs have explained several times why they don't want to use the single button PvP combos in PvE.

From an interview a while back:
Q: Can we have PvE skill combos like how PvP chains the skill combos? The number of skills we have to put definitely has been lesser since Stormblood but it feels like more can be done.
Y: If that happens, skill combo would be too simple and easy. Additionally, PvP uses simplified skill combos because we want to pinpoint the players’ focus on broader perspective of battle than using the skills in order. PvE combat environment is a lot different from PvP, where players need room in between combos to respond to various situations in the raids. That’s one of the reasons why we are keeping the the way of skill sets structured.


Quote Originally Posted by AlphaBetaEpsilon View Post
-Lightning Field, any jobs that use any type of gap closer will refresh their DoT's.
-Water Field, any job that uses a self sustain will be increased by 50% in this field.
-Smoke Field, any job that uses an AoE gcd will do so twice.
These don't have to be in the DRG kit these are just ideas for how much more interactive I want to be with people like I do with Gw2, and these are simplified variations from that game.
The devs go out of their way to specifically avoid abilities like that. This game has such a minimal meta in part because the jobs have such little ability interaction. Their goal is to avoid situations where you "need" certain jobs in the party. That philosophy might make the combat more simple, but it also means you don't see most players favoring or shunning certain jobs.