The funniest thing about the office days I go to is that they're not even used to their fullest potential anyway, which makes it clear it's just for the chatty gossipers to catch up on things and maybe some work will happen in between. Recently at my work, there was a support ticket (I work in software) for a script to be written in a way that hasn't been done for years (so there's been no direct need to learn). My line manager, in person, pestered me to take the ticket because they hadn't got a clue where to begin with it and they worried that nobody else was showing an interest. Delegation = yep, that's what managers do.
Someone sat next to me leaned across and said "If they really want to make use of these in-person days, they could do a coding session that involves everyone here, you know that 'collaboration' they want. That support ticket would be complete in a couple of days and everyone will walk away with some more knowledge." We both agreed.
There was even a time when a couple of outside contractors showed up to be part of it. I'd just returned from having had an investigative hysteroscopy for recurrent miscarriage, and there were these people sat across from me talking about their kids. Loudly. Tuning it out wasn't an option, so many unsavoury thoughts ran through my head, but I never once vocalised any of them. So I did what I've done for a number of years and stewed in my own misery.
Is anyone familiar with a YouTuber called Tom Scryleus? He's Swedish, he's highly introverted and is a consultant at a large company in Sweden. He described what it's like for an introvert to be in an office.
Paraphrasing:
"Imagine climbing into bed and trying to fall asleep in a nightclub while it's in session. You will get to sleep eventually, maybe, but you will be totally exhausted. You will feel broken and damaged. Now imagine doing that for 8 hours a day, 5 days a week, all year round with a few days off here and there. It's sensory hell."