The keyboard layout you're using was never proven to be the best one

QWERTY became the standard typewriter layout in the 1870s and stuck, not because later testing proved it optimal, but because switching costs made a rival layout too expensive to adopt once millions of typists and machines existed. Economists call this path dependence: early, sometimes accidental choices can lock in a standard a market can no longer profitably escape, even if better alternatives exist.

— Paul David, Clio and the Economics of QWERTY — American Economic Review, 1985