I don't understand what's wrong with the Logitech C920's output there. He has plenty of light, so it's a decent image. He talks about video calls and not video

I don't understand what's wrong with the Logitech C920's output there. He has plenty of light, so it's a decent image. He talks about video calls and not video production (YouTube, etc...). How great do the video calls need to be? And I get it, to each their own, but it just seems overly complicated. I think as long as you have good lighting, something like the c920 is good. I have a Razer Kiyo Pro and it's good too. My biggest issue is lighting. I have blackout curtains to keep heat out so my office is dark. I need more front lighting. Even an expensive set up like the article wouldn't help much.