It's one thing to use these tools yourself. It's quite another to walk around in public pointing a camera at everyone you look at, all the time.

You're technically correct. Using Gmail, Drive, Chrome, etc., does place a small burden on those you interact with (when they email you, when you store group project files, etc.)

But there's a whole other level of intrusiveness when you're roaming meatspace with a Google Camera in everyone's face.

Oh, and it's dorky as hell. Glass failed on multiple fronts. For the reasons you listed as well as the parent comment.