I wanted a gaming computer (read: an airgapped system that I could install arbitrary software on without fear), and I was sick to death of Microsoft's bullshit and resolved to never buy a Windows machine again, so I've been using a docked Steam Deck as my main gaming rig. It's performed far better than I imagined on the software side (has never failed to run any game in my library, though some have required minor settings tweaks), though the hardware is a little on the lighter side, which is perfectly acceptable for a handheld, but if the Steam Machine had been available at the time I'd probably have gone for that instead.