They spread the most commonly used keys all over the keyboard. You use the same finger to hit some of the more popular letters. You use the same finger to type d, move up to type e, and move down to type c. There is very little chance of typing fast enough to stick or jam the keys. Well, after 100 years typewriters have improved and we have computers.
Typewriters use wheels instead of keys.
The keyboard on my computer is instantaneous. The letters literally jump onto the screen. But I use the same keyboard they used in the 1800's. It's specifically designed to slow me down and it does a pretty good job. If I try to speed up I make lots of mistakes.