I initially agreed with this, but I honestly believe the modern Mickey shorts lend more to the attraction to the classic cartoons.
If you look at preview portions of the ride it truly looks like a cartoon. It is extremely bright and colorful, pops very well.
The new cartoons are more over the top in my opinion, the originals did wonky stuff, but the new ones are more consistently crazy. It is by no means a flaw with the classic shorts but due to them being played before movies instead of like a series like the new ones there are larger time gaps per episode.
Don't get me wrong, I still prefer the original cartoons but the modern ones are by no means doing shame to the ride.
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Just comparing the color palate between the two rides one is far more colorful.
If you look at a photo within the ride you can see it follows the hyper colorful setting of the new one which sets the upbeat tone for the ride.
It is by no means a fault of the Classic cartoons, but simply a stylistic difference as it is more grounded in reality than the new ones and the cartoons are created differently through differences in technology.