You learned key placement before you made your boobs so enormous that you couldn't see the keyboard, but now they tend to block reaching the keys in the center.
That's why they invented voice message and voice to text or voice controlled devices 
Ah, that explains it; it was to accommodate really big boobs. So now we need to bring back implant manufacturing to the US, get rid of the stupid FDA limitations on size, and offer expander implants to anyone who wants them at cost, since improving self-esteem will lead to a happier populace. It is a win-win-win proposition.