I wonder if HN’s usability would improve if these article would be marked with ($) or so.
I often click there for a cheap read on my commute and find it annoying when seeing a paywall rather than the article.
There are work-arounds, sure. Maybe you could even build them into the submission process. But they should still be identified to begin with.
I find that „feature“ unimportant, but if it‘s something the submitter must do, I‘m strongly against it. I would ignore such a rule, unless there‘s near-unanimous consensus.