In this day and age with everyone carrying a smartphone, there’s no excuse for using work computers for personal activities

There are plenty of reasons, mostly amounting to “Nobody tends to give a fuck” and “I’m not running out to buy a second high end laptop just to casually browse the web from my couch on the weekend”.

What you’ve got is a very poorly enforced, very draconianly executed set of deliberately vague and inarticulate rules that vary from company to company. And none of that really has anything to do with the “kill switch” thing. In the same way you might say “Well but obviously nobody should smoke weed in a state that criminalizes it! That’s just stupid!” when you’ve got the police tearing apart a particular person’s house for a completely unrelated issue, based on an officer’s exclamation of “I smell weed!” at the front porch.

Just accept you live in a police state and stop buying into excuses made to surveil and punish.