> at least the user isn't confused whether it's them that's doing something wrong or it's the page that just shoddily implemented

Users generally ignore all messages coming from their computers. They routinely blame their computers for doing things that the computers are not doing at all. Like, oh I can’t find the document I wrote three weeks ago -> obviously my computer is being disobedient.

Anyway, I don’t blame the users. To them the computer is entirely uninteresting and they don’t want to care about the sorts of concerns that we technically minded people do.

A broken page is a broken page and it doesn’t matter to the user why the page is broken. The only thing that matters to them is, can they do the thing they wanted to do or not. And like the sibling said, the web browsers are surprisingly good at handling broken code.