#47 - March 2, 2009, 11:37 p.m.
We don't design soloing to require a dps spec. In fact with the spellpower changes, healer dps is higher than ever.
However, you may find soloing to be faster with a dps spec. Often killing things more quickly makes questing faster, and dps specs are always going to be able to kill things more quickly. That's what they do. Being able to heal yourself is a useful tool when solo, but having dps so high that the target dies quickly is also a useful tool.
I have leveled with tanking specs and healing specs. It can definitely be done and depends a lot on how fast you want to move from quest to quest.