Apologies if the title is misleading. Really what I'm curious about is if every elementary has a point, at least in what we know. I know the different types of quarks are important of course, as they make up protons and neutrons, along with electrons. However, what about leptons and antileptons? Or antiquarks, taus/tau neutrinos, muons/muon neutrinos? Do they do anything outside of their gravitational and weak force interactions? Do they make up any composite particles that in turn do anything? They all clearly exist, but looking online, I can't find anything on if their actions are anything besides obeying the laws of nature. On wikipedia the quote "The eventual recognition of the muon as a simple "heavy electron", with no role at all in the nuclear interaction, seemed so incongruous and surprising at the time, that Nobel laureate I. I. Rabi famously quipped, "Who ordered that?"" is also present which seems to point that they really don't do anything besides exist.
If I'm wrong in this assumption and any of these particles do more than that, please do correct me, or are quarks and electrons pretty much all we need for the world to function, with the rest being largely just extra bits with some exceptions here and there?