Hawes has many talents on the offensive side of the ball, but what irks many is that he lacks a bread-and-butter here. He's just way too inclined to play in the perimeter, and while he's an excellent pick-and-pop option from mid-range, that means that rarely takes it to the hole or plays the post. It's unfortunate because he is a decent enough finisher and has nice touch, but by playing this way, it means that he never sees the free throw line. That's where some of his softness can definitely be attributed--it's his 3rd year, and he's taken way more perimeter shots than your average center. Shot selection isn't really a thing that looks to change over the course of your career.
Defensively is where the softness label should really be stamped onto him. His rebounding fell off a cliff this year, particularly his defensive rebounding, and he's been nothing more than slightly below average here throughout his career. He does have the length to block shots, but they're superficial blocks--the guy's team defense has been quite poor throughout his career with us, and individually he's also poor as well, as opposing C's always shoot well against him and always outrebound him.
My beef with Hawes as the starter here is that he doesn't play like a center at all--and that ultimately hurts us. He's got the Brad Miller-esque qualities down pat, from being an inclined mid-range shooter with passing ability and poor all-around defense. It's just that three years is a large enough sample size to make deductions, and softness pervades everywhere--down from the poor all-around defense, constant outrebounding, inclination to play perimeter--and you can't correct all that once, and if history has any say that might linger throughout his career. If that's the case, I think we will realize that eventually he might need to go for a better center, or he will have to assume a role down the bench. With his finesse game with shooting touch and passing, and length, he can definitely serve a 20-25 minute role, but unless he makes drastic improvements in toughness I doubt he can sustain more than that.