the folding canards, the landing gear, the wings not having a giant bolt running through them, the collapsable feet, the articulated hands, the articulated shoulder pads, the neck extendable neck shield, the improved tail fin design.
Sure, it's possible to do that on the 1/72 scale, but at the risk of fragility and some things, like the landing gear, would suffer greatly.
The 1/72 yf-19 was a POS compared to the 1/60.