Well, they actually can, but it is not magic, it might not work everywhere, but it indeed involves going against website demands. There is reader view in firefox (that parses a page and gives text and images), there’s ublock-origin that alone blocks so much adds and tracking that webpages load faster, there is ‘‘i dont care about cookies’’ (that automatically selects the cookie options on your chosen option), etc, stuff that could be implemented in the browser as options for the user just like privacy settings.