Not that I don't like Anti-Hero Sasuke (Five Kage) but Part 1 Sasuke was cool too. It just seems that Kishi deliberately set Sasuke to be anti-everything of Naruto. It all felt forced and inorganic. Naruto has never done anything to Sasuke to warrant Sasuke's multiple attempts on his life. Kishi should've stuck with Sasuke trying to kill the Leaf Elders Homura and Koharu.
Kishi answered that part.Its because he needed someone to play the role of "The Sulk" Lol
Heres the relevant part
"-the toughest chara to both draw and write about was・・・・ Sasuke
Despite he likes Sasuke, he found him esp as he went into a sulk, totally difficult to depict. He was often told to 'redo' sasukes face by his editor.
-on the impressions of the last chap (they must mean #699),
Ms Takeuchi and other VAs were " wow Sasukes talked a lot!"...(laugh)
-About the turning point of the story,
sensei(=kish) said it had to be 'the valley of the end' where Sasuke went into sulk and Naruto stayed as his friend to the very end....in short 'Naruto' is a story about bringing back Sasuke from the sulk.
-to the q 'what would you have done if Sasuke hadn't gone into Sulk?'
sensei answered probably hed have made some other chara sulk (laughs).
-to answer a q 'what has changed after starting the series?'
he said 'Sound nasty but money...' then added 'and the thinning of hair.'"
When you think about how disconnected Sasuke is to his Leaf peers in Part 2 in the manga, anime and movies. Sasuke seems to be excluded from the group activities frequently. And the way the manga ended, Sasuke still seems excluded. He never really could come home after everything he had done.
Sasuke is not a ordinary "legal" shinobi to stay in the village 24/7.He is the type to go out and gain knowledge,contemplate on himself and train to become strongest he can possible be.Besides if he stays in the village it would mean he accepts Naruto's authority over him which he wont allow.I have no doubt he returns to the village at times but as Naruto's rival and his opposite in personality it makes sense for him to stay aloof like "Batman"