I recently started playing through the game again since I hadn't played in... about two years according to my last save file from back then. (July 23rd, 2023)
I'd say the writing doesn't feel as obnoxious as the beginning and it shows. I certainly am not as pressed as you are about it, but it still keeps the overall attitude the MC has, he doesn't seem to be bitching about shit half the time as he gets used to this world.
Don't get me wrong, he's still an idiot as of where I am in the main story at the moment, but I get a humorous vibe from it now rather than feeling annoyed that he's... mentally lacking. He's still not dead despite the shit he does, so that's something. I can't tell if he's grown in that aspect yet, though...
Maybe he's just grown on me as I've continued playing.
This game is so fucking stupid, and yet I feel I wouldn't be playing it still if it wasn't.