I've mentally split the the "mandatory RTO" into three groups:
* I'm a manager that wants to know I have control over other people - often phrased as "I need to make sure people are working" and similar
* I use work as my primary opportunity for socializing, because socializing is important everyone else must use the office for this as well. I am not saying "all they do is socialize at work", I'm just saying that their primary social interaction is at work. That said I assume this category includes the people who keep interrupting their coworkers in non-office environments
* I cannot work outside of a formal atmosphere, and so I don't believe anyone else can either.
I feel like the last one could have some overlap with the first (e.g. "I can't work away from the office, therefore no one else can either") and I can't quite work out whether the "you cannot communicate effectively except in person" is more #2 or #3.
My distinct impression is for high level management this is more about control - there was an article a few months back where a bunch of managers were handwringing about how WFH meant they were losing the ability to leverage in-office social connections to under pay people (phrased in terms of avoiding people taking jobs for other companies). This one is insidious as it's leveraging the socializing aspects desired by group 2.