>>46264227Cultural reasons
The japanese have lots of examples of lanky and cool character design thanks in post to Studios like CLAMP that are kinda known for the style among many other animes like pic related, which shared the same design ethos, meant that they became more fond of the skinny-handsome complexion than the west, which was more used to the burly types. That's why they had a much more positive reception to it compared to the rest of the world