I keep thinking that; I don't want to believe this is just people who don't know how to use email and slack, enforcing their habits on everybody else. But, why has nobody come out and shared that data? All I keep hearing is these nice anecdotes about meeting random people accidentally, and vague hand-waving about collaboration.

(my own team is operations/application maintenance, and we are WAY more effective and efficient now that everybody is remote and on the same level. I understand that may not be the case in all fields/areas/teams).