Kids and convenience. 99% of the movies I’ve bought from iTunes are kids movies. Some of them were watched over and over and over.

DVDs and Blu-rays I purchased from the same era required a) advance planning and b) care. To the second point, most of the physical media is now destroyed (scratched, stepped on, lost, or just degraded), but I still have access to the copy of Cars I bought almost 20 years ago from Apple.