Thanks for your perspective! I've noticed that as well ( their appreciation of manga). Could be the method of storytelling, the visual look, the simple fact that it's not full of premises developed for 6 year olds in 1960...or all of that. There are U.S. books that appeal to GenZ, but they are few and they have nothing to do with what Marvel and DC continue to plague the shelves with.
What we can observe, scientifically, is that they very well do enjoy comics...just not the same tired old crap.