Interesting debate on both side of @Leigaon and @MistakeNot, but maybe I'm a little older and have been playing games for a lot longer, as much as I think things can always be clearer, I am siding @Leigaon over this one.

Every single red "!" tells you what is the criteria to unlock it. I can see someone over leveled the first 30 levels and went back to do their class quests, and therefore see no red "!". But that still doesn't explain why you would not click onto a red "!" later at a job quest.

Unless the job quest is not within the range of anywhere you will visit, the red "!" is very hard to miss even if you do very minor walking around, and if someone see that icon and choose not to click on reading, that is pretty ignorant by nature.