I just read this very interesting question and wanted to add the "obviously relevant but missing" misspecification tag - only to notice that we don't have it. Which I find surprising. We have quite a few questions on "misspecification" or "misspecify" or "misspecified", some of them pretty well upvoted - but no tag.
Does anyone have strong feelings for or against adding the tag to these questions (a few questions at a time, in order not to bump-flood the landing page), or even have a tag wiki and/or excerpt proposal?