I think the main difference in the industry is in Japan you have thousands of people using their creativity and writing all kinds of interesting and original stories. There are probably lots of terrible ones, but the cream rises to the top. The publishing industry selects the ones that will sell the most to distribute the most.

In the US you have a small number of consolidated industry gatekeepers, Marvel, DC, Diamond, and they're really bad at it, and attack their customers and competitors instead of getting good. Nobody with any sense wants to work with them.