The only reason I can thing of he'd be better off is if the job gets botched. I had a CrMo Trek fork bent by a framebuilder to increase trail about 7 years ago, and it is in fine condition today, still aligned and keeping the front wheel under control. And it's far cheaper than building one or buying a new one.

there's a minor issue of raising or lowering the front end, but this won't detract much from the effect of changing rake.