there is room for both in the world, there’s no point in saying it’s wrong. but the two revolutionary things about rap music was it was the first music to be made by recontextualizing existing music (i.e. collage) (or one of the first, musiq concrete I think started in the 60s?) and secondly it was the first music, or at least the first Western music, where the vocals were percussive rather than melodic in nature.
trying to insert melody into the flows just seems to be missing the point. but I suppose those who do it could argue that it’s another level of skill. I can accept that. I can also accept people deciding they like it without needing to justify it to anybody. but again, it’s just not for me.