Back in ARR there were cross job skill slots where you could assign skills/abilities of other jobs you had leveled up. However whining and laziness from players got that removed and replaced with role actions...

FFXIV honestly at this point is catering to people that don't play RPGs or MMO's hence the MSQ having the difficulty of a visual novel, the complete annihilation of build/job diversity, and the heavy reliance on linear instance templates and bosses essentially having scripted choreography that allows players to just do it over and over until they can shut their brain off and let their fingers run on auto pilot.