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For me the way has been using gyro aiming. It provides a mouse-like precision for aiming, which is really good for FPS games. It is supported on Staem nowadays. Of course on Steam Deck it may be not the best option in terms of playing experience, as turning the console also turns the screen.
That in general sense is linked to how logic works with conspiracy theorists and similar whackos: they have already decided the conclusion, every bit of information is interpreted as evidence.