It's only a good argument if you assume that Apple is fundamentally interested in consumer security. It isn't. Apple is fundamentally interested in control. Security, however Apple defines it, is a chosen means to the extent that is fulfills the company's primary goal. That's not to say that Apple should behave like a charitable force. A company's goals and decisions are its own prerogative. But as we've seen with the revelations of the Epic trial, the Darth Vader-style rule changes, updates that interfere with the basic operation of the device, etc., you're not just buying into a remotely managed system like a remote desktop at a colocation center. You're buying into the blackbox of Apple's present and future business decisions whether that suits your needs or not. Should security no longer justify the cost to Apple, they'll contort the meaning of the word to suit their ends just like Tim Cook has done to the word "equal" during his congressional hearing.