Mirror writing enables lefties to not smudge the ink (no ballpoint pens back then).
Every time there was a smudge on a piece of work, my 2nd grade teacher would tear it apart and make me do it all over again. I usually finished way before the other kids anyways, and even doing that I was still usually done before the others.
I can write really neatly now ¯\_(ツ)_/¯
> Every time there was a smudge on a piece of work, my 2nd grade teacher would tear it apart and make me do it all over again
Ah, the brutal conformism of education :(
Some inks dry faster too, so it's worth trying a few different ones.
I still mostly use a fountain pen for taking notes, which gets me a lot of weird looks at work (first for taking notes on paper, then because of the fountain pen).