All of these American examples are missing a key part of the Isekai genre which is power fantasy. 99% of Isekai involves the MC being an overpowered self-insert character that has a harem of sex slaves.
I consider Isekai and other world to be different aspects of the same basic concept.
The place I work at has a bunch of back-end developers that also have to pull double shift as front-end developers and it's very clear that none of us are really sure what we're doing with the front-end.