The funny part is the way Isekai is used now has been around in Japan for decades, but even going further back the old school Isekai were just an adoption of a style do story telling from eastern European stories into a Japanese style.

Those old eastern European stories go back hundreds of years. It’s funny to watch tropes people think are new in anime show up in old ass stories from like the Ukraine region decades before anything remotely close showed up in manga or anime.