The thinness of the lid isn't the reason it doesn't have FaceID. I have a Windows laptop with "Windows Hello" compatible camera (Windows equivalent of FaceID) that has a thinner lid than the MacBook Pro. Macs don't have FaceID because Apple doesn't want to put it in, plain and simple. (No FaceID on the iMac, either. Or the Studio Display. Both more than thick enough.)
Putting a small divot in the bottom would look and feel terrible.
As for quality of camera? It's plenty for webcam use. Laptop form factor makes a terrible "camera", so it doesn't need a 69 megapixel 10x zoom. It needs a webcam.