Sinner has the serve game stats of a serve bot, although his serve still can improve, especially for a player his height.
On top of that he already is among the best returners on tour. Not Djokovic-level, but he doesnt need to.
He also seems to share some of the mental features of Novak. He has won both USO and AO with this ongoing case, so pressure doesnt seem to affect him. He probably has the abilty to focus on the people who loves and believes him, and not all the hate, which would probably torn him apart.