Multi-classing has no reward?

[Jekyll]

One thing that would make multi-classing worth it for me personally is if they carried over this FFXI system I've been hearing about where, correct me if I'm wrong, if you have the appropriate class leveled up to wear a piece of equipment, you can then use that for glamour regardless of your current class? Is that how it goes?

Glamour is restricted by job. E.g. You cannot wear White Mage specific equipment as glamour on a Paladin.

On topic -

Honestly this whole "multi-class no reward" thing is a bit weird to me. You get to use the same characters and play whatever job you want. If it's not your thing you simply don't, but a lot of us enjoy being able to play different roles on the same character. There's literally no reward required as it is entirely optional.