The only problem I have with Freeman's position is that he made it public, letting umps and pitchers and catchers know he isn't arming himself with the same tools they have.
Batters sort of have a disadvantage here. In order to work up your confidence, you have to program your mind — at least for the moment — with the notion of your indomitability. You are so potent and prepared and locked in that the only thing that could defeat you is the malicious conspiracy or supreme incompetence of others.
That's all bullshit, of course, but you kind of go up there believing it anyway. You have to. So when a strike — especially a third strike — comes in on the corner, your first response is going to be "Oh, BULLSHIT!"
Now, when you relax your muscles and take a sober second thought, you come to realize that the fault probably lies with you and your judgment, but the rule says that the challenge has to come immediately, before you get to step out and take that breath. And your first instinct is to double-down.
Pitchers who feel like they executed their pitch but didn't get the call may have the same problem. This guy didn't give me the strike I earned and its damned personal! But the defense has the advantage of the catcher making the bulk of the challenges. And the catcher can be objective. His team has a stake in the call but there aren't any neurons firing in his head that says his manhood is on the line and the ump is undermining him personally.