[mmmm . . . except this:
Regardless . . . it isn't interesting to ask "Why the hell can't Revit make [insert shape]?" Because Revit can. It is YOU that is inadequate. Also, your shoes are ugly. Gaudi drew the Sagrada Familia with a ruler, a compass, a french curve, and a bunch of string. Man up.
[Oh, and it would be a major pain to make this:
The more interesting thing to ask is "why do you even WANT to make it in Revit?"
Do you want to create variations on a theme?
Do you want to understand the logic of the form?
Do you want to analyze it?
Do you want to optimize it?
Do you want to document it?
Do you want to make changes late in the game?
Do you want to build it?
Do you want to build it and still be able to pay the mortgage?
Do you drink Moxie, run marathons, or date Charlie Sheen? [This is just a calibration question to control for masochists. If you said yes, go ahead and make your goofy ass stuff in Revit. Don't forget the alligator clips and candle wax.]
If you said yes to any of these, then your life might have just got a little harder (but perhaps more interesting). If you said no, or even said yes to a couple of these, stick to your non-Workplane based, nurby, subD mesh 3d package with more robust booleans and fillets. Workplanes are a pain in the butt for freeform modeling. Make it in your unconstrained environment (without meshing it if you can), import or link the damn thing into an in-place mass, and hang some walls on it. Done.