For me it’s the paranoia surrounding webcams. People outright refuse to own one and I understand, until they go on and on about how they’re being spied. Here’s the secret - unplug the damn thing when you think you won’t use it or haven’t used it in a while.
They, whoever it is, can’t really spy on you on something that’s already off and unplugged!
I second all of your statements. I don’t care if my Apple TV is on WiFi, but my gaming desktop is most definitely hooked to an Ethernet cable. I also use a wired keyboard and mouse on it, but I’ll admit I have a cheap wireless keyboard and mouse for my work laptop because I didn’t want to deal with another set of cables on the same desk, and I can’t think of a good solution for both machines to share the same keyboard and mouse without having to switch the cables between them all the time.
A USB switch or the more expensive KVM could work.
KVM switch looks like it could work, since I don’t want to switch a USB switch and then still have to switch monitor input. Just need to find one with both an HDMI input and a DP input.
Windows? Mouse without borders
Linux/Mac/mix of that and windows? Barrier.
If, of course, you can install things on your work laptop.