Exactly. Which to me suggests this could result in more tracking rather than less. At AutoTempest we haven't even bothered to make user accounts thus far, sin

Exactly. Which to me suggests this could result in more tracking rather than less. At AutoTempest we haven't even bothered to make user accounts thus far, since there's no reason why you should need an account to search for used cars, and we can store user preferences in cookies or localStorage. If those only persist for 7 days though, we're basically forced to have users create accounts and store their preferences on our servers, to avoid a poor user experience. Blocking 3rd party cookies I'm fully on board with, but I don't want first party cookies deleted unless I actually specify it. Fortunately as a user I can keep using Firefox, but since iOS is always going to be a large percentage of our users, there's not much choice on the provider side.