I was replying to @nukeador’s comment, which makes clear that “it” refers to the idea of multiple layers, which is much easier with vector tiles and client side rendering where you can customise what is rendered for each viewer.
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I can’t find a way to edit my original post (or add tags) so I’d better say that Cristoffs’s diary and the Imagico blog (especially the triangle) as linked above are key reading. While there is the alternative approach of trying to solve problems by governance as was done with iD, it doesn’t raise the profile of alternatives, which is less serious for iD as other editors are well enough known. A building block for something like this could be infrastructural support like tile servers or vector tiles.