The numbers would need to be very low to make that difference. There are other reasons to change your keyboard beyond defects: language adjustments. Here in Eur

The numbers would need to be very low to make that difference. There are other reasons to change your keyboard beyond defects: language adjustments. Here in Europe we have over 20 different languages with different keyboard layouts... And in any case, even if it were a theoretical environmental gain - should the burdon for that lie on the consumer, who randomly looses her or his device, just so that every laptop is a tiny bit more efficient (and the effect would be really tiny)? Shouldn't in this case Apple carry the additional cost for repairs?