Any downside to assigning a Job to a Retainer?

[MilaDazol]

The job thing is especially useful if you are a MCH, AST, DRK or SCH main, and want to keep your retainer´s gear up to date.

Especially with SCH was a pain, as ARC is a DPS class, so the healer gear you could get didn't fitted on them.

For the rest of the jobs, the change barely noticeable.