He's clearly a servebot, but with an upgrade. Obviously he's more talented and varied in his game than Isner, Opelka or Karlovic, so perhaps he'll be more of a Ivanisevic or Philippoussis type servebot as he progresses. Many of you guys seem to be impressed by his movement, but it really only is in context of his large frame, which doesn't make it great overall. Watching him against Tiafoe he seemed a bit slow and clumsy occasionally when put out of position, and there were a number of shots that landed not very far from him that he just let go. Also, as others have correctly pointed out with the unflattering stats, his return is pretty terrible, so that should be the absolute top improvement priority for his coach. I do like that he utilizes the chip and block returns because not many young players seem to even know how to do that these days, but he needs to find a way to keep those lower and deeper in the court. They sit up too much.
He should count himself a bit lucky that he won't have to face the Big 3 - they mercilessly feasted on guys like this. That being said, I'm pretty confident he'll move into the top 15 next year based on his insane serve alone, but if he can improve his return he'll go even higher.