Why do they need the developer to be a rockstar?

To Rock and Roll :/

They need you to port GTA 5 to smartphones, duuuh~

Rockstar, ninja, Jedi... I don't like those job descriptions.

@Eariel That's so they don't have to give you a proper title and get to pay you less.

Job adverts are a good clue to company culture.
Companies looking for rockstars will have lots of snacks and ping pong tables, but will expect 60+ hours/week.
Companies looking for Senior Developers might have snacks, will probably have 401ks, and offer reasonable time-off policies.

Maybe the love of his life left him even before he knew she was the love of his life and now he can only song about cluless birds 🐦 🐦

Also whatever he wants to say is destroyed by his words

Maybe they only want devs who drink Rockstar. :P