Well, let me rephrase that there are a lot of people who would identify him as easily their favorite "artist who produced raps" even if we're saying that's not necessarily a "rapper," but the fact that it distinctly is rap in some sense is a huge part of the appeal, even though the "appeal" in question heavily leans on treating rap as a novelty that is only an art in-and-of-itself insofar as you can do lyrical miracle bullshit with it. Basically I'm saying LMM is like if Lil Dicky did slavery apologia.

Edit: And some of this legacy from Hamilton is pretty enduring, like for example being responsible for the worst parts of Epic (not bad overall, to be clear, but it's got some really bad parts).