They should ban it just because it's a poor image. The colors are unnatural, it is low resolution (blurry) and has a bunch of weird line noise, it's just not representative. The obsession with sticking to it has always seemed odd to me.
I 100% respect Lenna's wishes to stop using the image. I have a small tinge of regret based on some of the comments in the subthread, but it is for the better.
I even own a copy of the Playboy this was taken from, but funny thing is, I have never opened it. It is on my shelf next to the Utah Teapot. I guess in a way, I could justify it as one less use of the images.
Stable image reconstruction using total variation minimization
https://www.semanticscholar.org/paper/Stable-Image-Reconstru...
Oh man, if only this were true.