What? My Wizard, Cleric and FvS can solo plenty of epics. How many bosses live longer than it takes for me to spend my mana bar with dots? How long do you think it takes me to get SP back when I throw up my shield and let conc op and Torc refill me? The blue bar is pretty much limitless. The only time I ever run out of mana on my FvS is when I'm healing melees in raids. But if those melees were FvS, there would be more damage being done, and everyone would just heal themselves
I understand that their power is limited to SP, but they have a TON of SP and options to restore it.
And this is a team game, I don't really care if it's balanced for solo. I like soloing with my blue bars, scroll farming and seal farming is a good way to kill time. I wouldn't do it with my melees though. They can't just intakill all the trash, shrine, dot up the boss like any of the spellcasters can.