Touchscreen devices aren't supposed to require a stylus. But there are times when you might want to use one. You probably draw better with a stylus. Your handwriting is more legible with a stylus. You don't leave fingerprints with a stylus. Using a stylus doesn't block your view of the screen.
Because modern touchscreens are capacitive sensing, they take the conductivity of the human body as input. It doesn't matter how much pressure you apply. It's the electricity flowing through your fingers that cause a change in the screen's electrical field. That change is interpreted by the device as input.
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