> [...] many [photographers] know better than to mass convert low quality JPEGs to WebP.

Correct, but this is the workflow that the engineers behind WebP recommend, so I think it's entirely fair to pick on it.

> Anyway, the rant elevated my knowledge very little. It was more like anti knowledge.

Then perhaps you weren't the target audience. I'm not a photographer, and the rant has offered me a little bit more perspective.