You're perfectly right. Problem is that the very price structure of the various RTs releases makes it clear that it's far more cost-effective globally tao buy the whole packaged styles whatever the genres.Result: you end up with zillions of styles, substyles and "fusion" styles you rarely use, if ever...
I personally use brazilian drums loops in order to extend the choice of samba grooves (i.e. Marcha rancho, baião) instead of realdrums that go "one size fits all".