I think this is a great move for a number of reasons, but as one commenter said, I think Allow/Deny are just simpler terms in general.

White/Black are abstractions and adds one more hurdle for folks new to the industry - especially those from different languages and cultures where white != good and black != bad.

I think this is good for social reasons, but I hope the industry in general moves away from black/white because its just not the best way to convey these ideas, its just the one that stuck.