Keyboards exist the way they are because typewriters did it that way for nearly 150 years, and had to be that way because they are a mechanical device. We havent even changed the design of PC keyboards since IBM basically perfected it in the 80s. Theres probably a lot of room to improve the keyboard, but we dont because simply its already a refined invention and fimilar. For example, qwerty made sense on a mechanical device, but it makes zero sense on an electronic device. But familiarity keeps people on qwerty. Funny enough, this effects touch keyboards too.