1 I even re-read Sword Dad, especially where he blows his cover in front of Amanda.
Kumoko is of course crushes everything, and it even has a story, apparently (it's based on LN that is quite a bit ahead of the manga).

Not sure what your problem is with Nonbiri Nouka, it's super funny, especially how he forms a 100-women harem despite only wanting to farm. It's like that meme where Pepe hangs a liberal and says "why did you make me do this, I only wanted to play videogames". I re-read that one too.
I think isekai is not at all mined well for the anime. They have kickass mangas both in conventional iseakai and in chick isekai. And for some reason the studios and directors managed to butcher recent adaptations quite badly. The Deathmarch, How Not to Summon, Sumafo were all underwhelming when compared with the manga.

2 I don't dislike Nonbiri Nouka, just sort of underwhelmed with it.  I might enjoy it more as an anime.

3 Though given the state of recent anime adaptations - I'm with you there, they're not picking the best sources and often not doing a good job with what they do pick - I might not.

4 I suspect that because there is so much Isekai material available, nobody's willing to commit the resources to do one of them well.