I find the opposite to be true. If I’m at home I better push a commit, because otherwise people will think I’m slacking off. If I’m in the office and visibly in front of my computer however, I can be doing anything at all and I’d still be considered productive.

Since they’re not collaborating with you, and are presumably a well paid professional, maybe their collaborators are perfectly happy with how they work?

It only works if people see you. Dressing up for sitting at home feels silly.

Presumably because they’d be punished for sharing such information and you don’t rat out your friends?

Fair, my experience is pretty much 25 years out of date. At the time it was pretty good.