There may be more to Shanks than meets the eye
What does Mihawk have?
He's literally just "I'm the strongest and I want to be left alone"
He exists to lose to Zoro at the end of OP
Carrot has nothing? Compared to Mihawk? lol
That's because you can't read.
Mihawk has a lot of depth.
Hes suffering from success so much he's bored like saitama is
He has/had clear gripe with shanks for losing his arm for luffy till he met zoro
Hes also had a clear personality change from before reaching his goal to after achieving it where now he has no desire to rule or fight and wants a peaceful life
A marine hunter who was likely aggressive and destructive all his life
Then there is the question on why he doesn't trust anyone
And this man like you say has had no panel time