He needs to do more of this—address something that directly affects Apple's products—and less spouting off on 'social rights' shenanigans, which have nothing to do with Apple products and everything to do with using his position at Apple to make his own personal political statement, something which Steve Jobs rightly never did.
I'm sorry if I misunderstood you. But in my opinion Tim Cook is not Steve Jobs and the world is spinning on, even after the Steve Jobs era. Meaning, the more various techniques involves around each individual his or her life the more relevance is the question about privacy becomes.
There is one issue even Apple can't change with chips and machinery; ethics. Therefore it's good to point out the differences towards people. Tim Cook isn't saying that Google Photo service is a bad product, he just points out that with handing over all of your private data towards one company that actively is using that data for commercial reasons is something to be aware of. It's not that, for example, 'Face recognition' is a bad thing, it becomes bad when it's been applied towards so called services towards a person that he or she didn't asked for.
Almost nobody does read the agreement rules when applying for a services and without being aware of the consequences people, especially youngsters, give companies everything they need.
The next step is just a small one to take, for example, insurance companies that have full access of your daily life activities and based on this information grand you or denying you acces to their services. That's just one of many situations one shouldn't agree on.
Next worrying fact is that these companies becoming increasingly larger each year. It has come to a point that users find it more difficult to subscribe to a given online service because they have a hard time finding a login method other then using the quick "login with Facebook or Google". Many users are not even aware what it means to use your login account from Google to make use of a service other then Google. Each activity will be stored and used for a more detailed profile of that user.
In Europe we've, god thanks, strong laws against this way of privacy mining by companies.
In short, one can't be to gentle with these matters, it's good that Tim Cook made this speech, he should it do more often.