Why does so many games on nintendo switch not support keyboard & mouse like the switch is compatible with k&m Fortnite on Xbox & PlayStation is has k&m support so doesn't fortnite

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Keyboard Mouse Converter：Keyboard and mouse adapter for video game consoles, use keyboard and mouse to play video games.Using the converter, you can

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Switch mouse and keyboard converter can convert keyboard and mouse signals into controller signals to play the game, providing better game control

ECHZOVE Keyboard and Mouse Adapter for Nintendo Switch, Keyboard and Mouse Adapter for PS4, Xbox One, PS3, Xbox 360

All Xbox One games with mouse and keyboard support

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