I'm not speaking personally, I levelled everything but ARC (couldn't get into it *shrug*), and I agree that people who only level 1 class are limiting themselves..but that's just it..People don't mind limiting themselves, but they hate others limiting them.

It basically comes down to.. "I don't care about the other job's story and gear, so I'll play what I like." and "WHAT THE HELL DO YOU MEAN I CANT FIGHT THAT COOL LOOKING BOSS BECAUSE IM NOT A DRG! F*^% YOU SE!"

And people will flood the forums with that crap endlessly.