It is there, but hibernation is a pain to implement since it doesn’t have much in common with other OS functions, so eg device driver engineers don’t enjoy implementing/maintaining it much.
It is useful in laptops as a last ditch effort to avoid losing data when the battery dies, but that’s one reason phones don’t implement it even though their batteries die much more often.
It is useful in laptops as a last ditch effort to avoid losing data when the battery dies, but that’s one reason phones don’t implement it even though their batteries die much more often.