FrontPage didn't generate your content for you! So there was no reason to assume a FrontPage page might be meaningless just from how it looked. For AI-generated sites, though, if the page looks like slop, is it worth bothering to figure out if it actually is slop? It's not like they're uncorrelated variables. Sure, occasionally it won't be. But I'm drowning here. I must simply assume that if someone is serious about conveying a message, they won't package it in this form.

I don't think it's even gatekeeping. You could copy-paste two tables and write two sentences into a Word document and export to HTML, one of the laziest possible ways to produce a website, and it'd still be less off-putting because it doesn't have the association with slop content.