There is some quite interesting thinking about the three types of perfectionism. But in some cases, a lack of empathy or external awareness can be an issue. But I take your point - he may just be someone very well connected to his own feelings. Which is rare, if not complex.
(and point...
Firstly, I called him astonishing and complex. And I don't see complex as a negative. Definitely not hand wringing.
Secondly, you are describing his behavior. He appears, at least in public, to be pretty consistent. I was referring to the complexity behind that. What are the drivers for someone...
Chatting to a spurs fan yesterday. She was raving about our performance in the cup. I was flattered, but had to explain that we didn't play to our usual standard. She didn't believe me.
We really have stepped up a level under this astonishing, and very complex, man.
Not trying to rekindle yet another Caicedo thread. Now about how or manager might feel. I did worry that de Zerbi might be feeling like a lack ambition, as @sparkie says