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On a QWERTY keyboard, think about the letters "I" and "E", which the middle fingers on your right and left hands respectively would hit. Both require your middle finger to reach up and slightly left. It's not a mirrored movement—both skew left. The stagger breaks symmetry of any non-home row finger movements.

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I think I see it, it seems to me that my finger naturally wants to hit in between "E" and "R", but it hits exactly on top of "I".

So ortho fixes this, but could it then introduce problems for other pairs? It seems hard to believe that there is a layout which is 100% better for all combinations.

Regarding symmetry, our hands are already asymmetrical due to handiness (left-handed, right-handed), and the brain naturally adapts, and there is also the risk of Hawthorne effect if you A/B test ortho/staggered. Some real studies on layouts would really be useful.

Ortholinear can be interpreted as 0 stagger, but still takes time to adjust to. However, when I was using ortho at work and ANSI at home, it didn't take much effort for me to alternate.

Ortho layouts are also most often used on compact boards, and the Preonic (5x12 grid, '50%' form factor) is probably the most 'plug and use' friendly ortho I've come across.

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