Is not only improved, but it’s getting better. I find it hard that a controller didn’t work on Linux. Which ones were there? Xbox works plug and play, always had. Linux got Play Station controls to work on them before Windows had a driver for them. Originally those things were paid options on Windows. Third party are pretty much cookie cutter drivers that all have always worked seamlessly on Linux. If you have any lingering doubt, you can read the reviews on the Steam Deck, essentially, if it works on a Steam Deck, it will work on a PC with Linux installed. Steam’s BigScreen mode turns any regular PC into a controller-centric Console like experience.