I realize that I have actually seen it too many times.

And the dynamics are super-similar to the ship war factions, where each "side" thinks they are so very different to the other , and their beloved favorite is so very different to the other, and they really aren't.

fuffy is a f/f version of spuffy - dysfunctional love/hate relationship at the beginning and redemtion/forgiveness at the end)

Total agreement there, you've summed it up perfectly.

Buffy/Willow probably just too much resembles Willow/Tara, so people don't consider the non-canon pairing when there already is the canon one.

That's an interesting point. But doesn't that contradict your statements about Spuffy/Fuffy ? Or really, any non-canon relationship shouldn't even exist if that were the case - why Spangel, Spander, Bander, and dear god WHY Buffy/Giles?

Never mind that the Buffy-Willow friendship IS canon, and central to the series.

Non-canon ships seem to fill a need (with me, Bara fills a need to see Buffy loved and cared for tenderly and give Tara a bigger role in the story than she got in canon). So what need does Wiffy NOT fill? People love friendship fics, but when I hear people talk about "the Scoobie gang" they mean specifically Xander and Willow.

Is it lack of at least one male character + lack of romantic / sexual chemistry = no interest? So even the friendship is neglected? *ponders*