It's not the only data that is available for deriving a tracking key. https://panopticlick.eff.org/ https://panopticlick.eff.org/ Why are you pretending that

It's not the only data that is available for deriving a tracking key. https://panopticlick.eff.org/ https://panopticlick.eff.org/ Why are you pretending that there is some sort of difference between "tracking a user" and "tracking the user's browser", which is close enough for most tracking purposes? Tracking the browser is tracking a user for a vast majority of people. For browsers on a phone, it is even more likely to be a 1:1 mapping.