Seconding keeping canon divergence out. Basically, I can't imagine that someone who wanted a canon-divergent AU would be unhappy with something that retained the canon setting but wasn't necessarily AU and vice-versa.
Maybe "Canon and Canon-Style AU" is a better label than "Canon-Style Plot" to emphasise the role of the canon setting? This contrasts with "Mundane/Modern AU" and "Genre AU" where the characters are similar but the setting is fluid -- to the extent that the discord with canon might irritate some people (including me!). It is also distinct from "Worldbuilding" which sits at the other extreme, where the canon setting is all-important, but one might not particularly care about the characters.
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Maybe "Canon and Canon-Style AU" is a better label than "Canon-Style Plot" to emphasise the role of the canon setting? This contrasts with "Mundane/Modern AU" and "Genre AU" where the characters are similar but the setting is fluid -- to the extent that the discord with canon might irritate some people (including me!). It is also distinct from "Worldbuilding" which sits at the other extreme, where the canon setting is all-important, but one might not particularly care about the characters.