As a longtime Apple iPhone lover, I switched over to Google Nexus 5 around 6-8 months ago and with it, I decided to try and be as open as possible with my data. This means that I opted into allowing Google to read my mail, save my Chrome searches (and start using Chrome), saving my notes in Google Keep, and then regurgitate all that information back to me on my Google dashboard. I thought to myself: "Once the next iPhone comes, I'll determine if I should go back."
At first, it was striking that one day I booked a flight and then about two weeks later, my dashboard mentioned to me that I should leave 40 minutes early for my flight because of a traffic accident. It knew my flight information, when I should leave, and routes to the airport. I followed Google's suggestion and made it to the airport on time, taking an alternate route Google displayed for me. Once I landed, Google updated my dashboard about the currency exchange, surrounding events, restaurant reviews, foreign news, and more... it "knew" I wasn't home anymore, but across the world. It was initially strange, but with more trips and more experiences, I grew to like that Google could give me handy data.
Another strange thing, when reading my mail, it would point out words like "... On Saturday, Sept. 4...", then ask me if I wanted to save it to my calendar. Small touches like this grew on me and kept my life in sync.
Now, having spent many months with the phone and with the release of iPhone 6, I've come at a crossroads in trying to find out how "okay" I am with giving Google my data. I wonder to myself, "how can Google use this data against me" and come up short. There are things I wish to be private and for those things, they are rare and I use the appropriate channels (Incognito Mode, other email accounts, etc.), but those are much more rare than the typical. It does sometimes bother me that ads show my interests, but other times, I've actually found it surprisingly useful and it has led me to learning about other products available.
I suppose for Apple to release this comment, I agree on the one hand and can see their point, but I wonder... Sometimes it's nice to have certain services available to you, if that means giving some information out.