>Like “the UX of HTTP is horrible”? Still doesn’t make any sense

Sure it does, when all browsers have more or less the same, and the context makes clear we're not talking about the mere programmatic consumption of HTTP (like through some REST api).

"But it's a protocol and not a client" is pedantically irrelevant, given that the clients for that protocol all follow the same conventions. The parent already said they meant the UX of it "which is arguably similar between implementations".

Besides, protocols impose some concepts and models of interaction and consumption, which informs any UX created on top of them. So it's not like that client sameness is merely accidental and unrelated to the protocol either.