Why bother having campfires when we have portable space heaters? Heck, why bother camping at all if we have a nice comfortable space at home? More generally, why do any of the things that connect us to our past?
Personally, I think it’s important to learn by doing and then provide a “here is how we made that easier, and now you know why” type of foundation. Perhaps better is having people develop versions of those solutions for themselves so we don’t just expect someone else to solve all of our problems.
Historically, that didn't seem to be the main reason for the many inventions of the typewriter. See https://en.wikipedia.org/wiki/Typewriter#History
> According to the standards taught in secretarial schools in the mid-20th century, a business letter was supposed to have no mistakes and no visible corrections.
Certainly, there were other reasons like speed, repeatability, official-looking, etc... too. Most typewriters wanted to be cheaper and on-demand printing presses. Some even managed variable width fonts! :)
But I'm not sure why you quote something about the md-20th century, when we are talking about the (many) invention(s) of the typewriter? They were already old and well-established technology at that point in time.
If the computer is the one transforming your writing it should be perfectly quick.
To be clear, afaik current handwriting recognition software is not good enough for this. But if we had software that could transform bad handwriting into good handwriting, why not go all the way?