True - I have an old Kona Paddy Wagon setup fixed with risers but it's used a fart around bike to the store and stuff. It's fun and different but I am not looking to replace my USB with it.its one thing to take your fixed gear commuter and blast a handrail pegless, like my friend did a few years ago. but when you make that bike heavier, fit worse, and geared too low for your commuting, ditch the fixed gear.
there isnt a single FGFS trick that is current that inherently requires the fixed drivetrain. keo spins needed it, but those are out now
Beside those fixie freestyle guys cannot do the 2 best/most fun things on a freewheel bike - manual and ride good trails.