Stunning that this can't be fixed. This is not a design feature but a flaw, or rather a dictate from Evernote that we "must use the tool the way we want you to". One simple fix, no need to complicate things: "Share this notebook" with a check box option "allow tagging". That would make a lot of people happy. And I wouldn't guess that it is a huge technical hurdle. You guys at evernote might now like it, but your users seem to want it. Let us make a mess of our tags(mine are a mess anyways) if we want to.