I think the problem is that the people who are prone to do this are also prone to fiddle and over-complicate things. For the last 18 months, I've been using a wild-overkill mirrorless camera through an HDMI->USB adapter dongle thing (not the El Gato, it's one that uses a standard UVC driver so works with Linux with zero fuss). The adapter limits it to 1080p resolution, but that's plenty for webcam work, and all I do to use it is flip the power switch on the camera.
The advantage in my case is huge: I have a bright window to my side (and I refuse to close the curtains and work in the dark) and a white background. My c920 would expose for the average brightness level, and made me look like I was in the witness protection program. With the mirrorless, it has more dynamic range, and also I can set the exposure manually so I always look fine and the background gets a bit blown out.
I agree with people saying that better lighting (I look better when I use the Key Light as a fill light on the opposite side of the window) and a better microphone (Rode USB mic on a boom arm that I keep positioned just under what's visible in-frame -- still close enough to my mouth to get good sound without the "hey, don't forget to like and subscribe" effect) are more important, but doing a better camera is better, too.