R&D Most (?) human's middle fingers are longer than the surrounding ones so from the ergonomic point of view an inverted T is the only thing which makes sense.

R&D Most (?) human's middle fingers are longer than the surrounding ones so from the ergonomic point of view an inverted T is the only thing which makes sense. Getting your middle finger on the same row as the other 2, or the row above, feels ok. Row below feels awkward. Multiple buttons on same row as well unless the keys are quite big: middle fingers are also not very small. It's likely also why an inverted T is the de facto standard for 'normal' keyboards I guess. So one can only wonder why anyone would ever do that differently. Just for the sake of being different and the revenue that might bring? Which would be a bit of a shame for a company which takes pride in design.