It occurred to me that an unusual advantage of these higher-leveled tank and (likely) healer jobs is going to be picking up roles for alt characters.

I'd like my alts to have healer and tank jobs available to them, without necessarily having to level all the way from Lv1 (as I have already done with plenty of other tank/healer jobs already).

If I can work my way back to Lv60 with a DPS job and instantly collect a tank and healer, that's going to save some time.