Instead of looking like rad like Knuckles the Hedgehog walking on the Moon, you look like Bambi going after his gay rabbit friend.
There's a lot more exaggeration of the movements and making it look "lightweight", dynamic, full of complex movements that add frills to the style.
The older stuff is more crude, half a dozen moves with very blunt movements, arms move way less, it's more "stomping" than fluttering around.
I don't know how to describe exactly, but I tried. Compare this classic moonboy >>>/wsg/3329454
With this contemporary bobbing girl: >>16783948
Hopefully it's visible.