As silly and pointless it would be to cancel stoneskin, it really isn't a huge gain to stoneskin a entire group. I mean, in a pug or on a progression fight, sure it has it's merits (which it sounds like this was both).

When I play white mage, and a random group I'm in demands I stoneskin the group (often while I'm already in process of doing it), I just kind of think it's silly. Especially when the tank wants their stoneskin and won't pull the first trash mob until they get it. It' just going to break super quick from that single trash mob.... lol