From what I’ve read in Brian’s posts, the mechanics have been changed – not sure how it affects feel. I had an Arc in the past (the previous edition to this one) and don’t recall the physical wheels spinning on that edition.
On my new one, the thing I needed to relearn/recall was the gesture of adjusting the knobs on the edges, almost like the rim of a glass. I’ve also played with force and friction on Ansible Cycles to change the feel.