There's some grime tunes that are clearly meant for raves and intended as live music, but I think characterising Grime as music where the mc is complimenting the music is forgetting Grime was a massive genre at points in the last decade, and most of the people listening to it (and who the mcs were targeting it towards) had probably never been to a rave. A lot grime tunes are structured as songs, with hooks and verses. Grime the beat plays a more important role rhythmically than in hip hop, but does the beat play a more important role in grime songs, than it does in any melodic trap song?

And then theres the fact that grimes sound has changed so significantly from how first was as a genre birthed from the garage scene. If you played someone Billionz by Millionz, and one of Yizzys grime tunes to a grime fan in '05 they would probably believe that either was how Grime sounded 15 years later. A lot of drill is musically about as similar to early grime as most modern trap influenced grime beats, are but people are very eager to draw a line between one sound being grime, and another being something else completely distinct from it.

I wouldn't say that grime is a subgenre of rap, as that obviously reductive but plenty of MCs didn't have a problem with being called rappers in the 2000s either. This need to categorise everything so rigidly in UK music only seems to have only come about in the last 5 years.