There's also more to game than pure damage output. I know this might be hard to believe, but sometimes purposely gimping yourself for a better challenge is more enjoyable than steamrolling everything in your path just because you can.
In my case at least, I don't need to pick more than two schools...because I will be carrying companions with me and have zero interest in silly Glass Cannon or Lone Wolf at the cost of potentially interesting characters and story that comes with them.
Hybrid builds do work, and can work very well. Just because they don't destroy everything in their wake it at first glance it doesn't make them any less fun or good either. Some of the perfect examples of how good hybrids can be are littered throughout pencil and paper RPG's and the video games based off them, if you take the extra time to understand everything you need to know.
