How useful a scout is aside, the only actual problem I have with the Hero's party is their attitude; why are there so many asshole Hero parties, rather ones with common sense?
Instead of having fun throwing shit at someone, why not just have characters that do not feel like they need to be malicious little shits? It doesn't even promote the MC to do anything special, since this is no revenge-porn and his success doesn't tie together with their achievements.
It doesn't even feel like this story wants to have the MC "show them how good he is". The Hero's party are full of little shits, and there's no meaning to it.
I feel like so many Jap authors just have no idea how to write disagreeable characters, without going full Chinese and making them evil scumbags.