>Having the high hats and fills be twice as fast (or more)
>as the beat's tempo is NOT boom-bap. Not an evolution of it.

this has never happened. its just different note values 1/16, 1/32. its always the same tempo

>It's that southern / trap influence.

man prince paul had those hats on Stetsasonics first album in 1986

>Also I associate boom-bap with sampled drums or drum machine
>sounds that sound like sampled drums -- and not electronic
>drum sounds.

you do realize the earliest boom bap records basically all used drum machines right?

>Boom-bap is faster the examples you posted from Drake. Drake
>is usually slower - except for fills and hi-hats -

nah...those joints are hip hop tempo and if the hats were playing at a different tempo than the rest of the beat you wouldn't want to listen