To add to this, if the phantom clicks are indeed primarily happening while typing or otherwise moving your hands near the touchpad, you should check to see if tap to click is enabled. The unintentional clicks that feature produces drives me crazy and I have no idea why it’s always on by default when a physical click or button is always available.
Steam Deck compatibility has a much higher standard since it requires the performance being good, gamepad support, etc, and even that’s at 40%. General Linux can’t be less than 95% for games that don’t require kernel level anticheat. Try checking a random sampling on https://www.protondb.com/.