I don't think cursive's ergonomic claims hold for lefties, as we have to push the pen instead of smoothly pulling it along. Perhaps if I were writing Arabic, my opinion would be different.
I'm a lefty and have found cursive very comfortable (and I'm also both an underwriter and an overwriter.) Perhaps if you're a sidewriter you get the worse experience of pushing a pen.
I definitely find writing a nicer experience with a pencil, a fountain pen, or a felt-tipped pen - ballpoints require too much pressure to be comfortable.
As a lefty side-writer, I find no challenge with using cursive. Writing in print is also pushing most of the time so I don't understand the claim that lefties has to push more.
