If you just want decent video quality for a zoom meeting where everyone shows up in their pyjamas then I agree -- setting up lighting like I described is wasted effort.

But for example, if you are a teacher, or an instructor, or if you have a video meeting with important customers, you may want to put some more effort into presenting yourself. And the best bang for the buck is improving lighting.

Sitting in front of a window is a nice solution for an overcast day, but it doesn't work after sunset (currently around 4PM where I live) or on a sunny day with hard light. Unlike styrofoam boards, it's also hard to control the light because you can't move the window.

I'm not suggesting everyone should do what I said. I was just sharing a possible solution if you want to make good looking video.