It only works when you don't have children (kindergartens and schools start at 8) or spouse (who can have a different schedule) or office work (so you don't have to be at the office at 9.)
Time has stopped being an astronomical fact, and is a social contract nowadays. It's possible that you can afford to opt out of that contract, but most people can't.
That's mostly true(*), and we should work on making the opt-out a standard procedure where ever possible.
Instead, the public discourse centers around which minority can force the majority to follow their preferred terms in the social contract. At best, it's a zero sum game - most likely, it's a net loss for everyone if we include all externalities, especially the suppression of discussions about more individuality.
(*) DST is not a social contract, it's entirely made up by the law.