Exactly!
A cgi design does not take actual real world physics and real world movement into consideritation.
They don't just "add" joints. That would work if the figure where constructed of things like a solid lower leg, a solid upper leg, a solid torso, a solid neck, a solid head, a solid lower arm, and solid uper arm. But becuase of manufacturing, removable pieces, batteries, electrical pathways, switches, and painting they are more like 150-200 individual parts. It will never work or look exactly like the film. Not at our current level of technology. Probably 20-50 years for anything close to perfect 1/6 scale articulated robots.
As u can see...from photo...not just a 3d print with added joints. That's what every single iron man figure has to be broken down to after the prototype is approved. And why they may look different. And why painting is such a time consuming and expensive part. A cgi file is essentially just an animated drawing. Just more advanced. Not trying to take away how skilled and amazing cgi is. But it's still an animated drawing. It has none of the real world constraints. Nor the manufacturing problems and challenges.
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And all of that does not take into account the viewer. You say they look elongated, but others say to stubby, or to rounded. Not everyone looks at things the same.
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