So... turns out I may have been a little too dismissive of my little HP Prodesk 405 G4 Mini's specs. I mean, I knew it's Ryzen 5 2400G is a not terrible Ryzen chip, and as such was somewhat suited for low 1080p gaming. But more or less by accident, I found out that in benchmarks, it's more or less comparable to the Steam Deck, but with slightly worse multicore performance in benchmarks, some give-and-take with the iGPU, and a limit of 2GB of VRAM. 😅 If it had a big SSD, I'd give SteamOS a go.