I am ambidextrous and I know lefties who write very well cursive with a fountain pen. Spelling and grammar have gone downhill because of the SMS language.I have always hated cursive since I'm a lefty and it was always more difficult for me to learn. I don't see the point in it, we need to teach kids how to spell since autocorrect has dumbed everyone down.
I always use a fountain pen and write always in cursive or in spencerian. Most people in France and in Europe write cursive and if someone who couldn't read what I wrote in cursive, I mocked him/her ironically by asking him/her at which school he/she went.