>>11194786My guess is that while angels and demons are cool, using angels would feel disrespectful or, worst case scenario, cultish; remember that Japan abused themselves, from top and bottom, into becoming a non-religious society so people who are religious over there are treated as dangerous cultists.
Or maybe it's simply that demons have strange alien names nobody wants to use in a serious manner but still sound cool while angels often share names with real life western people. Like, I have one cousin who shares a name with one of the few angel-themed beys in the series. Imagine announcing a combo named, idunno, Michael Wing 4-70 Ball. It's weird when you think of the names you'd end up with.
Another reason might be that marketing is aware that Japan has had angels more present in girls media than boys media and want to keep Beyblade a franchise for boys centered around competition.
So far, that I know though, they used Gabriel and Uriel in Bakuten and Raphael in Burst. Not unheard of but pretty rare. It didn't help that late V-Force was pretty overlooked and that Gabriel and Uriel weren't mass retail releases over there while they got released here as part of G-Revolution.