Please do not consider me as troll but I have really understandable analogy of my point - cancelling slavery in USA. Slavery makes suffering, and QWERTY layout also. Why we are using QWERTY instead of ABCDEF? Just because of a marketologist of Typewriter company which decided it is a good idea to foolish people about typing efficiency of QWERTY. He placed "random" word "typewriter" on the upper row of the QWERTY keyboard. And any manager while selling a typewriter demonstrates the "fast typing" of the "random" word on Typewriter's typewriter. From buyer's point of view QWERTY seems like more efficient layout then ABCDEF, and the new standard has been established. Sorry but your question about 10% is impossible to answer and I do not sure the "bad" standards you have chosen are any worse than the similar standards in other countries.