Since there's zero chance that websites and ad companies will stop their spying and manipulation (let's call it "webpage neutrality"), what you're proposing is unilateral disarmament. To require a lot of know-how and tech savvy to get privacy, while leaving the common user to the mercy of a hostile web.

This is like the argument that the Do Not Track flag was illegitimate if the browser defaulted it to 'on'. An argument that is never applied to tracking or the countless "by visiting this webpage you consent to.."