Why is this so hard?

Why is it so hard to have a 700c wheeled folding bike with a steel frame, in a fixed gear?  I'd take any three of those four and be happy!  And I'd like it stock, not a 200% 'custom' mark-up, thanks.  Instead, I can get these dog's breakfasts, usually in aluminum and single-speed with children's wheels, and no reasonable way to run fenders for something as eccentric as weather.

Montague Boston

Xootr Swift

Dahon Uno

Why isn't this available?!