>You lose out on spurious connections because the other people are hybrid on different days.

This. This so much! What good is it for me to be in the office if the people that I would need or want to work with in-person aren't there on my dedicated day? Why go if just to attend virtual meetings?

Also doesn't help that a lot of spaces aren't designed well to foster the collaboration one might want on a hybrid schedule. No, I don't want an entirely open office floor plan, but the cubicle farm isn't any better in 2023.