The original iSight had a hundred times more depth and also happened to be an external camera. Bringing it up here is irrelevant.

It's not irrelevant, it's information that allows any reasonable person to conclude that Apple implemented a solution before and has since decided to exchange that simple and effective failsafe for a marginally thinner product. I can't physically control whether I have a naked camera pointed at me all day but hey, at least my laptop can fit into a manilla envelope, right? Right? Totally worth it.

It’s irrelevant to bring up iSight’s shutter because they are totally different products. It was literally hundreds of times larger than the cameras we’re talking about here; so it makes no sense to expect a shutter on these just because iSight had them more than a decade ago. That’s like saying that a racecar should have folding seats because a minivan might have it and they are both vehicles.