I see the point of Joe. But he is applying his own perception of height bias on Akash.
Height neurosis (this is the term doctors see on us, height-challenged persons) is influenced by many factors—personally, culturally, nationally. A good parallel can be found in a forum like this. Not everyone would aim for 6'2." And everybody here starts from a certain height from below 5'5" to even above 5'10." But each would have different expectations and goals.
A 5'2" guy from China would be happy to be 5'5" but some 5'11" from Serbia may still be aiming for a height well above 6 feet. And the doctor should recognize these divergent perceptions, and if both are not psychotic (which I assume they are not), they will operate on them.
In short, height neurosis is very subjective and relative.
If Akash is happy to be 5'2" then that's it. Joe shouldn't apply his morality (Joe is implying that Akash is profiteering from this mediocre transformation, for example, by writing a book) on Akash. But if Akash is sweet-lemoning his increase in height, then I agree with Joe 100%.