...Since when is enchanting an elven thing?
Just to toss it out there, I don't believe he was saying that only elves use enchanting, but that with certain elves (wood elves comes to mind) hatred of void magic, they tend to look at alternatives.
The most widely accepted definition of abjuration magic tends to be found in DnD, so I'll quote that here: Abjurations are protective spells. They create physical or magical barriers, negate magical or physical abilities, harm trespassers, or even banish the subject of the spell to another plane of existence.
Having read through your post, I find a bit I agree with, some I'd like to see changed... But over all gave it a +1.