Expecting people to find a group isn't realistic. There just aren't enough players and there isn't any sort of grouping system; I haven't seen a single EXP group below level 45 on my server. It's worse than FFXI, so being able to solo is a must.

Also, the arguments for spell interruption given here are beyond ridiculous. FFXIV is not real life. It doesn't matter what you're doing to cast the spell; good game mechanics come before realism. If you want the game to be realistic, we may as well change Blind to black out your entire screen and then make most monsters one shot you; you aren't going to be alive after being impaled on a spear, are you?