That's not really improving, that's putting up fake difficulty through making the interface harder. If anything I think the HW rotations were too brittle to enable any improvement; something like byakko ex would have been a nightmare with the HW set. All the boss and player movement would have broken buffs left and right with a much higher threshold of player skill. As for jobs, I remember DRG especially because I couldn't even fit all my abilities on a full 24 slot crossbar; there were so many dps up buffs that it was absurd. It's been years though. I actually mained WHM in HW precisely because it was one of the easiest classes in that expansion.