Continuity doesn’t rely on issue numbers, it relies on the creators of today remembering and referencing the stories of yesterday. That happens regardless of what numbers happen to be on the covers. And those little yellow boxes you speak about haven’t been widely used for about a decade now, ever since we entered a world in which everything was most often collected in book form, which made them more off-putting to casual readers than ever. Saying that we can no longer do something that we’re no longer doing in the first place isn’t a very convincing argument.
Pretty sure if Marvel, or any other publisher for that matter, wanted to go back to including editor’s notes they could always just say see issue X, volume Y ( or volume Y, issue X). You know, like they’ve done before. I really think you’re over-estimating how vital the numbering of a title is. Also, shouldn’t anything that brings in new readers be looked at as a good thing? New readers generally means more books; of course, that also means more number ones, so I guess I can see where that would bother you…

