This cut feels so incomplete like all of the in-betweens are missing. I get that was the style they were going for most likely, but it really doesn't work.

I couldn't disagree more.

It works a bit less than in the opening, but whoever animated the fast paced cuts there and here (same person or not) knows how to keep the action flowing and the impression of what's happening quite clear, despite having drawings so differents from one another. I mean, I'm having quite an Imaishi-but-less-cartoony vibes, I'm loving it !

works perfectly for me