Open Source doesn't mean automatically that applications look ugly. It only means that they look ugly on non-Linux systems. Like VLC Player, Open Office, etc.
Linux systems are easy to install. The real challenge is to diagnose an issue. What caused the crash of GTA V? The new Mesa drivers? The new Gamescope update? Some update in the game that breaks in conjunction with KDE running in Wayland? But you launched the game in xwayland, how could Wayland still cause trouble? Or is it the latest FEX update you installed because you saw a Youtuber playing Elden Ring on their iPhone 14 Pro with HoloISO and you figured that the 15 Pro should handle the game perfectly?