I honestly don't know why people doubt him over his "lack of technical skill." It's an overused idea and it really doesn't matter. He can finish from all angles and ways, he's scored with his head, acrobatic goals, volleys like this weekend, goals from tight angles, it doesn't matter at all.
He isn't limited in his scoring at all and whether he has a great touch or not, he knows where his teammates are and can link with them. Look at the goal he got vs Roma with the link up with higuain, and see how he returned the favor vs sampdoria. His spacing is amazing, he knows how to find teammates, he isn't limited in his ability to score specific kinds of goals. He is a complete forward and we should stop worrying about him. He even scores in big games, there's zero worry in my head about his ability at all.
The ONLY thing he needs is a bit more consistency. And that's due to age, he's in his second season only. If and when he gets that, he will be a consistent 20 goal striker easily.