Lots of companies distribute their employees laptops with a little plastic slider to shutter the camera, so it's further than not-just-nerds - corporate IT decisionmakers are recognizing the need too.
Trouble is, lots of laptops are subtly (or not so subtly) damaged over time by extra stuff being closed in the lid. Apple laptops, notably, but plenty of others too. It'd be much better for it to be built-in. Covers also ruin the (absolutely wonderful and hard to do without, once you're used to it) True Tone feature on Apple laptops, so they'd need some kind of secondary ultra-low-res never-exposed-as-a-real-camera color-temp sensor to properly support either built-in or add-on camera covers or kill-switches while still letting that work.
(I'm basically agreeing and elaborating, not correcting you, since your point isn't that that's a great solution, but that it's more proof that more than just security geeks and computer nerds consider this a problem)
In fact last year when it was okay to meet your benefits providers in person, one of them handed out plastic stick on webcam covers you could slide back and forth with their logo on it.
(I'm basically agreeing and elaborating, not correcting you, since your point isn't that that's a great solution, but that it's more proof that more than just security geeks and computer nerds consider this a problem)