Doctor M said:

Pocahontas and on, I don't think there are any issues to worry about.

well, just browsing again in the internet and searching about Disney films.

To tell you the truth, I prefer the DVDs that retain the grain, even if they are compressed.

They look much more cinematic to me.

Here in the NTSC DVD of Hunchback, the grain is still visible, but on the Bluray it's non-existent.

(strange, my PAL DVD, isn't as good as this NTSC DVD, it looks a bit de-grained. I guess it's the compression)

NTSC DVD vs. Bluray

By the way, I don't understand why HDTV versions have grain and Blurays don't.

If they wanted the HD to look grainless, why they retained it when they showed it on TV?

Anyway, that means that grainy HD versions exist, and I hope they will be released when the new format (4K) comes along.