Steam and Steam games are x86 apps and require a huge pile of voodoo magic including microVMs to make work on ARM64 systems. We're working on it (Asahi Lina (朝日リナ) // Cyan Nyan's manager maybe ✨ (npub1cxq…6wtz) has been testing it) but it's far from ready to ship to end users right now.
Good news is once it *is* ready we fully intend to beat Apple/macOS at it, because we actually have standards-conformant graphics drivers and they don't :)