I assume thinness is part of the problem--my high-end Logitech webcam is about an inch thick. Also webcam quality was probably just not much of a consideration until fairly recently.

But, even if someone doesn't more or less set up a studio as I've done to a degree and some of my colleagues have done, there are some pretty basic things related to lighting and webcam height that can be done pretty easily by most people. Though I'd add that comms problems are also a frequent annoyance and there's not a lot people can do there.

I'd add though that I normally move around my house when I'm working. Sitting at a desk all day in a "studio" doesn't really work for me.