Very interesting. Thanks.
I think this further proves that lighter switches aren't "better" for typing, as some assert. Force preference is entirely subjective, and different strengths of switches are better suited to different people's fingers, not different activities. Although many people prefer lighter tactile switches for typing, (myself included), I always find it annoying when others put down linears and heavy switches for typing as if they are simply not suited for it.
Anyway, awesome video! That's insanely fast
Hope you enjoy your 87U!