"Spliney" means that some of the motions are too smooth and gradual.
Most commercial high-dollar animations have the same tendency.
It's sort of endemic to CGI.  Real-life movements are usually more
"snappy" than spliney; we tend to hold still until it's time to do something,
and then we get the limb to the desired location quickly.

If you look at old-fashioned drawn animations, you'll see more snap
than spline.

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