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specialist
No, it's just CAD practice. Since the VumaChrono we've had Vision Metron and Campag Bora/Bullet, neither of which has exactly flown off the shelves, plus the Look Zed track crank.
Within the constraints of pedal axle support and chain clearance on 11-speed bikes, there isn't really a good reason to try to make skinny cranks. If you go too thin you lose stiffness fast, the limiting load is torsion and to a first order approximation that's proportional to the fourth power of the minor axis. 15mm thick is where we are now, if you went to 12mm you'd have to double the major axis and then you'd be at >6:1 chord:thickness and the UCI would start moaning