Netflix is specifically buying local productions. Changing them on fundamental levels just to cater some us-viewer seems pointless.
The idea that fully-written scripts are just made without any input or pushback from the funders/producers is not how the film industry works.
But the point is that Netflix specifically buys productions from different countries, to cater to the fans of those cultures. If they wanted to have a US-ified script, they wouldn't need to go to such lengths, they could just hire some us-asian writer to get another ethnic US-series.
Netflix funded the production. Netflix has an influence on what the script is.
At no point was I interested in arguing about whether it was a “Korean show” or not.
[0]Example: https://about.netflix.com/ja/news/asura-trailer-special-art