nah Sasuke doesn't deserve a permanent new arm, that's why he refused it, he has made huge mistakes and he must remember them forever, going on a trip alone is not enough.
also he tried to killed his best friend with that arm, the one whom saved him from himself, it's symbolic.
Sasuke punishing himself by not getting a new arm is unnecessary as it doesn't help anyone. Its like if Zuko in avatar chose not to heal his scar since he accepts it as a part of him. The problem with this is that his father gave him that scar for a mistake that wasn't really his fault.
The main difference is that the scar has always been a huge part of Zuko's character like Kakashi's sharingan was a big part of his character.
We haven't seen Sasuke very much with 1 arm so its not been a defining part of his character for very long. We saw him for like 22 seconds in The Last movie which is the only time we see him without a arm yet his left arm stump is covered by his cloak in The Last not counting the last chapter of the manga.
The idea of a 1 armed swordsmen is cool but Sasuke has so many ways of getting a arm so I don't see the point of him punishing himself.
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