On my old MBP, the menubar starts below where the camera module is.
That area rarely gets used, so why not put the camera there? It is weird how large the area is, however. The camera is a fraction of the tab's size and there aren't any sensors on either side, I don't think.
You pretty much forget about it after a week or so. The only people who make a giant fuss about it are people who haven't used a system with it for very long, if at all.
Of course if you were in the kind of environment where it might be a problem if your computer unlocked as you walked by, you probably wouldn't enable the feature anyway. As it is I am annoyed by iphone and ipad apps that require faceid or other login each time as I'm the only one who uses those devices anyway.
Nevertheless I think faceid on the laptop or imac is an insecure idea.
I wish I had it on my Mac.
… especially when your mouse hides behind it and it takes a few milliseconds to remember the notch
Once you’ve used it for a few days, it tends to fade out of awareness. If you really don’t want to see it, there are utilities that make the menubar black so it blends in.