And for new macs the off switch for microphone/mic if the lid is closed is hard wired using some "dump circuit logic switch" AFIK.

The problem with lights (even if hard wired) is that you might still find ways to brake them, like finding a way to fry them without braking the camera or switching on/off so fast that it isn't really visible but you still get some image/sound you might be able to post process to a point where it's usable even if not grate. You probably can prevent this with further hard wired circuits, like a hard wired "super slow de-bouncer" which in a on-1->off-2->on makes sure 2 is prevented if not at least Xs passed since 1. And which in a off-2->on-3->off cycle makes sure the LED is on for at least Ys (the camera can be switched off faster, just not on again). But I don't think apple has something like that. At that points the question is why not put in physical switches like e.g. on Framework laptops or some older ThinkPads.