Did a spontaneous reread, and this really is a pretty good exploration of what Isekai could be. Both the worlds could be manyfold in their ways, but also the hero's brought over, and it does it's own playing with scenarios, that seem like a baseline, yet are all way more creative than what the actual market contains, lol.
It really is a shame that it shows how much potential the genre has, only to see how little of that is used in practice