So I’m significantly ahead in the light novels and let me tell you something: He just parried an elder god to death, and he’s still pretty oblivious. I haven’t read the very very latest novel yet, but I’m sure he’s not going to undergo any kind of major epiphany and become brilliant.
It’s the core humorous concept of the series, that he’s a strange person who has no sense of common sense.
I always figured slime is a story about the power of friendship, so sometimes you need some chatting around a table because friends don’t just use demon lord powers on each other all the time.