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The rest of the time I'm going through emails, filling out endless bureaucratic forms/documents, doing mandatory training, and every now and again I get to actually write some code (more likely: reviewing PRs), LOL! My performance reviews are always spectacular and I'm the only one in our (much) larger team that's actually 100% in compliance/up-to-date with everything and completing all my work on time.
The one thing all those tasks have in common? They can wait five minutes while I take care of something and if I'm on the phone I can do something else entirely while I'm listening. Just the other day I did--the horror!--laundry while I was on a call discussing how we should move forward to solve a problem. And I was the one speaking most of the time while I folded my laundry and put it away!
I could easily watch a 6yo and do my job at the same time. Based on how much real "work" comes out of your average corporate office employee I'm certain they could do the same.
Employers should give zero fucks about what their employees are doing while they're at work as long as they get all their work done on time and don't cause the company any problems (and no conflicts of interest). We hire people to get things done not to dress a certain way or keep a chair warm in a very specific place all day!