Yes, some of them can be used without the energy waste. As far as value goes, Dogecoin likes to say on it’s website, 1 Dogecoin = 1 Dogecoin. It’s done a pretty good job at holding that value, lol
Despite what any website might say, all of the hype and “value” of crypto always comes back to dollars. If you take that away, I don’t see how anyone will want to stick around short of super hardcore techies.