I dunno. I learned more about light from [1] than anything else i'd ever read or saw. Am i an expert? hell no. I do have a far, far better handle on how lenses and mirrors work though. I think you'd be hard pressed to claim that either qed isn't that complicated, or, this lecture does a bad job of describing it.

Although, i would agree that some experts do a bad job of explaining things. They're still experts. I think you'd agree that non-experts don't really have a chance at explaining things.

[1]https://www.youtube.com/watch?v=eLQ2atfqk2c