I simply don't use a headset or a webcam with my home Linux setup, because it's often been a hassle to deal with, and my work setup is separate. For screen-sharing type coding interviews, I have a perfectly functional remote SSH setup from my windows laptop, which took less time to setup than the last time I fiddled with a bad headset connection on Linux a long time ago. I find the "not using all of screen real estate" accusation to be strange as well, because usually screen-sharing is ergonomically limited to 1 screen, but people may usually work with two screens and not have developed habits to make 1 screen work.