What about the airline site I need to buy that plane ticket on using Google Analytics? What about the trackers embedded on the university website I need to access to apply for college? You're implying there's a real alternative choice where you can just not go on websites with trackers.
In addition to those examples, it's significant that you can block Google Analytics without blocking ads, if you're worried about privacy more than disruption. In practice, blocking trackers is a privacy issue for me, while blocking ads is a security issue. Sites that are content to run ads as text or linked static images get through, but social media trackers and arbitrary JS from ad networks doesn't.
Also, you can turn off any of that blocking after you first visit the site. I don't understand how the narrative of "you agreed to use this site, then went back on your part of the deal" is supposed to work when the only way to discover what you're agreeing to is to land on the site and let it happen. Do Not Track was supposed to be a (partial) solution there, letting you state your conditions for use on arrival, but we all know how much respect those conditions got.
