I think your last paragraph is the real issue that will forever crush improvements over clicking on stuff. Once you get to "buy me socks" you're just entering some different advertising domain. We already see it with very simple things like getting Siri to play a song. Two songs with the same name, the more popular one will win, apply that simple logic to everything and put a pay to play model in it and there's your "agentic" OS of the future.