This might finally prompt me to start compiling Firefox for all my devices, or at least evaluate some of the high profile forks.
It's not just about the data, it's about the lack of consent. If you just ask people for permission on the initial startup, I'm sure most people will be fine with enabling it. Last time I installed Firefox, it just showed a tiny bar at the bottom of the window, which is pretty easy to miss. I'd expect fewer dark patterns from Mozilla, that's the kind of shady behavior you see coming from Microsoft. I always try my best to disable or block anything which phones home without explicitly asking for consent.
Tunnelblick [0] is a good example of this being done well. On the initial run they ask if you want to enable automatic updates. It includes the option to disable sending anonymous system information, as well as including a disclosure widget with a brief explanation and a table showing the information that would be sent. [1]
[0] https://www.tunnelblick.net
[1] http://i.imgur.com/tWQX5aB.png