It is a case of right tool for the right job for offroad riding…
If I want to ride a trail centre I use my Ragley Bluepig
If I want to ride regular XC trails I use my Trek EX8
If I want to ride from my door I use a fatbike becauseI live right on the coast.
Most of the trails around be are really sandy, even in the forest singletrack. Owning a full fat means that I can ride where I have to push the other bikes. This also applies to really soft & boggy conditions
Out of all my bikes, the fatbike is the one I use most & have the most fun on, even if it takes a little bit more effort to get uphill.
The also make an awesome offroad touring bike!
And you can take them up some really big hills!