Yeah - I've actually softened my own stance since I wrote that paragraph near the end, too, I just didn't feel like editing a message that I claimed to have copy/pasted. While I still have no intention of enabling the feature in my install, that's out of pure spite for anything that could conceivably help an advertiser somewhere, even if it isn't at my expense. I do see value in the feature itself existing. While I think the industry is unlikely to abandon tracking cookies and swap to this system voluntarily, I could see certain governments eventually mandating such a change, if the feature proves robust enough.

I might even go as far as to agree that on-by-default is the better option for the feature's chances of success - but for new installs. When new features are added to existing installs in updates, particularly if those features are in the "Privacy & Security" section of the settings page, it would probably be better practice to ask the user to pick an option on the first boot after updating.