Just because you use galuf as a monk so often that you think those are his real clothes, doesn't mean that bare=monk
(I do that. I restarted the game and saw galuf's real clothing and was like "wtp, when did he dress like this?" then when I got back to the monk job class and slid him in it I understood)
But yes, if you're bare, suppin, don't have any job class you're dressed up in, y ou get to choose two abilities.
And people do choose this once they master all the others because of the reasons mentioned before.
I beat the game the first time with mimic:] mimicking the bahamut summon= <3