Force Spuffy ficwriter compose a fic about happy Buffy\Angel reunion - the result will be either parody or honest failure. Force canon-respecting ficwriter create an AU story with Fairy!Spike, Witch!Buffy and Cinderella!Angel - the result will be the same.
Although there are writers who happily write both human AU and canon-based fic, or who write multiple and often incompatible pairings, and are quite good at both. (Like entrenous88, for example.)
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Although there are writers who happily write both human AU and canon-based fic, or who write multiple and often incompatible pairings, and are quite good at both. (Like