The difficulty in a job is NOT to press 1, 2 and 3 in sequence. Except in the few classes that have extended, non-linear combos and you need to combine them (SAM/MNK for instance).

In a DRG, for instance, the difficulty of the job is learning when to enter Life of the Dragon, remembering to apply all oGCDs when necessary and not missing out, choose which combo to apply, and lining up with buffs. The difficulty of the job is NOT learning how to press 1-2-3 in sequence.

The 2 main combos and the AoE combo could safely be folded into a button, while leaving "Wheeling Thrust" and "Fang and Claw" out, while retaining everything that's interesting from the job, and allowing controller players to have a better time.