Rackhir said:2) They bypass SR.
The second reason is really about the only reason to use them at all. You can do the first with energy substitution. So to me the question comes down to "Do you dislike spells that can bypass SR." Cause if you are going to eliminate that aspect of the spells, you might as well ban them cause they're basically useless without it.
Yeah, that's the problem I don't like direct-damage spells without SR.