[mlyle]

His point, I believe: artistically interpreting the motion and shape of humans or objects with larger moving parts makes animation look more on-style.

But for "boring" rigid objects, there's less of this advantage; hence, the consistency benefits often are more important.

[numpad0]

unless it's Miyazaki films - in which case most humans are intended to be lifeless rigid objects and every machines are to be lifelike animations (/s)