It's the meaning that matters, not the order of characters, words or letters. If the characters and words are in such order that the content is understandable, why should spelling matter? If anything, 2 people with equal amount of time, and a person who doesn't spend time on trivial typos would be able to write more meaningful content within that time.

Of course, if you do have automated systems setup to correct everything, then by any means, use them.