It's really interesting how early films like A Fistful of Dollars took inspiration from Japanese cinema but in return they had a great influence on Japanese culture and media going forward.
“Inspiration” is generous for Fistful given that Kurosawa sued Leone, albeit with admiration for the film anyway. And of course Magnificent Seven was just a western remake as well. Fantastic films all around, but “inspiration” went a little harder back in those days.
It's so weird that Akira Kurosa, reknowned for his Samurai movies, was such a huge influence on western cinema as a whole and the western genre in particular, but once you watch his work and realize when he did it and that some of the best known western tropes today originate in his works... everything just clicks into place.