Colemak is a tradeoff between ultimate optimality, and shortcut / punctuation positioning for those switching from QWERTY. I agree, if you're learning a layout from scratch (if you're a young child who can't type yet, for example), then learn the best you can get. But if you're switching from QWERTY, the compatibility Colemak offers is indispensable (see the "Other layouts" section of the post).
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Colemak is a tradeoff between ultimate optimality, and shortcut / punctuation positioning for those switching from QWERTY. I agree, if you're learning a layout from scratch (if you're a young child who can't type yet, for example), then learn the best you can get. But if you're switching from QWERTY, the compatibility Colemak offers is indispensable (see the "Other layouts" section of the post).