Control is key.
Harry is a control freak. He admits as much. He just can’t abide not knowing something that he’s supposed to know, no matter how trivial it is. He just needs to be on top of everything. If you ask him what is phantom power and he doesn’t know about it, he will stop whatever he is doing and research about it. He will read and ask and learn whatever it is he can learn about it. He will get back to you and tell you about it in simple terms, digested by his ever-expanding mind.
For Harry, control is key. He just feels vulnerable when not in control.