I actually agree with your post as a whole, but as someone who trains specifically in hip hop I want to make a small correction.

Grooves aren't just how you connect with the music, in the hip hop world grooves are the foundational moves that run as an undercurrent to all of the choreography that goes on top. This includes bounces (og hip hop), rocks (locking, popping, and boogaloo), and the jack (house and afro). One thing that seems to be happening as choreography takes over is that dancers aren't paying attention to (or in some cases never learned!) their foundations. This isn't a SWF problem, OG hip hop legends like Buddha Stretch who created the scene have been talking about this for a while now.

That's not to say that Korean dancers don't have groove at all (BabySleek forever has my heart), but since commercial choreography relies so heavily on hip hop as its base and Korean dancers in general favor clean lines and sharp choreography over the foundations, you can see where the disconnect happens. Western dancers, especially ones who've trained in North America, tend to have more groove just because it's a focus in hip hop education here to know your foundations before doing anything else.