I think there are some deep misunderstandings about what the button is supposed to do. Please click the “Reader” button on your browser (Safari, Edge, Firefox) and compare. That’s what it’s supposed to do.
Interestingly there is no reader mode in Chrome but there is this hack:
That said, I am open to a “couldn’t pull any body, so just pull the first video or image” algorithm that kicks in when readability / reader mode fails.