I'm trying to think of a reason why recast timers are even needed anymore when you switch jobs, and I can't really think of anything.

I remember why they were first added. It was because people were using tranquility and exaltation to get back mp on other jobs. Well those skills don't exist anymore and there's really no skills you could really exploit that way, since you can't change jobs in battle. Only one I could maybe see people doing, is the bard HP buff and then switching to something else, but then that only lasts a couple minutes anyway, by the time you got far enough into an encounter for the buff to actually be meaningful it would have worn off.

Really, might as well just remove recast timer reset when change jobs, I'm pretty sure it's pointless now.