Maybe because they are always the same with that 3D model, or because they are so monotonous, Maybe they already do it only to profit and not with the intention that they are as good as before (I'm not old guys). Those caricatures so well done with love, and I say with love because they were made by hand and they put all their effort and dedication for that, those cartoons will always be remembered as the best. Well it's just my opinion and my point of view.
the images of the process:
Here you can find the reference image that I have taken to elaborate this drawing: Source image
