As long as advertising corporations keep control of your web browser, the experience will always be optimized for ad tech and maybe some other megacorp interest

As long as advertising corporations keep control of your web browser, the experience will always be optimized for ad tech and maybe some other megacorp interests, but definitely not for you. That's the problem. I imagine a web browser actually made for the user will try hard to extract content from web pages by default, render them with decent consistent UX and not blindly let third parties display and execute any crap they want. There is no reason to render say articles with comments in thousand different ways for thousand websites. And no reason it can't be blazing fast on RaspberryPi.