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the float advantage they have over normal MTB say 2.6" is very minimal when you factor in limits
basically, the snow needs to be packed hard in order to ride, 2.4-2.6" MBT can deal with about 1.5" of fresh snow on top of this before it's a lost cause and you're going nowhere
fatbikes can deal with like 2"-2.5" of fresh snow before it's a lost cause, so the window of where you'd want to be on a fat bike is super small
one other spot where they make sense is if you have local trails which ban anything but fatbikes, all the MTB trails are like this in the winter around me as 2.4-2.6" can sometimes sink into the hard pack a little bit causing ruts, trails around me are multi use in the winter for XCskiing and snowshoeing, the spaz the fuck out if you hike on them
