I generally play caster classes. Especially healers. I'm used to long casting times. So for me Bard and Machinist weren't completely alien to me when I got to 52 with them. Still I agree with you though. I also loved the run around style of them pre 52.

Biggest issue to me is, that these 2 jobs play style changes completely. The other jobs don't change that much, if at all.

Edit:
Been noticing that in POTD many Bards and Machinists don't even use Wanderer's Minuet or Gauss Barrel.