Thanks very much for the reply. I’ve split off the Marketplace requirements part in this post.
Everything you said in your reply made sense to me, and I’m glad the feedback is useful. (I work in DevRel too, so I really empathise with trying to keep docs up-to-date for an evolving platform.)
I think the remaining open aspects are really just in the Marketplace post now. (There’s still the technical matter of why the publishable URL wasn’t working for me but the testing URL was, but I think it’s worth waiting until there’s more resolution on the Marketplace post before coming back to that.) Feel free to close this topic now, and happy New Year.