WFH is existentially painful for those that have coupled their identity too strongly to their jobs. They're confronted daily with the fact that their coworkers just aren't that into them (e.g. the job, and by extension, them) as they'd like. The likelihood this has happened goes up significantly as you move up the ladder, because the volcano gods demand sacrifice for that.
There's also a segment of the population that somewhat overlaps with the previous paragraph that uses work as their primary social outlet.
I think this and the slightly less gracious way that OP explained it is the most significant driver of RTO from the employee side.
It is also why I am shamelessly pro-WFH. The banality of this mindset as the possibly main major contributing cause from labor for RTO and all the many, many issues that office work causes is too much for me to handle.
Get some non-work friends and hobbies. Understand career mobility and productivity, if that’s what you really want to prioritize, is equally there via WFH. Leave the rest of us out of it.
There's also a segment of the population that somewhat overlaps with the previous paragraph that uses work as their primary social outlet.