Yup. People != Everyone.

I will argue a bit for the value of noise (visual or auditory) of causing you to stop processing each individual element and accept them as one whole though. I don't think that argument applies to pin registration shake on film animation, but if every element of a mix were perfectly dry it would sound unrealistic (even live, arguably the highest fidelity of music for this argument, has room characteristics).

Regarding hollywood it was originally a way to make the CG elements and live-action elements actually blend. Once they went all-digital it didn't make as much sense.