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It moves your pinky, your smallest and least mobile finger, to move up two rows, which requires a typical person to completely flatten that finger. Either that, or you end shifting your whole hand. Which means that you end up moving your hand a lot while typing because the underscore may easily be the most common keyboard character encountered in some programs.

Obviously everyone has different shaped hands - but for me, the pinky doesn't need to be entirely flat to reach the underscore. I also don't have to shift my whole wrist.

Either way, reaching the + key on QWERTY-102 is objectively more difficult than the underscore [uses the pinky, is farther away than the underscore from homerow], and also requires a shift-modifier. I use + far more than _ while I'm coding. (And I'm currently writing most of my code in Go, so I use _ quite a bit since it's a blank identifier.)

Maybe I just have big hands, but it honestly doesn't impede my typing at all to add an underscore to the text.

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