The argument against doing so is, of course, the slippery slope argument. At least some of these feats and archetypes could be argued to work with other races. I see no reason why the Wild Caller couldn't work with gnomes (makes more sense than half-elves to me, in fact). Why is the Deadly Courtesan restricted to Vishkanya? Etc.
Now, am I against opening this door? Not entirely. Does racially-restricted equipment make sense? In some instances, but definitely not all - there's no good reason why claw blades be restricted to Catfolk, for example. But, anytime someone raises the idea of bending RAW, I start to wonder about how far we bend.
I think the best argument for removing racial restrictions on equipment on at least a limited basis is that we likely won't be approving even a majority of the races added by the ARG. It'd be nice to still have access to some of the new content associated with those races, or, conversely, to feel like we can decide whether to add a race based on itself, removed from its unique mechanics such as archetypes, equipment, etc. But again, if we start down this path, I wonder why we can't go further. I'd personally like to see many less racial restrictions on some of the archetypes and feats in this book, which is, of course, in direct contrast to the ARG's spirit.
Just some initial thoughts. Also - anytime SK suggests a ruling
against RAW, it makes me inherently nervous. Because he's generally such a stickler for them.
![Stick out tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)