I'd like if you address the main point of his post: being left-handed.

I've never liked fountain pens because most languages are written left-to-right, which means you will get smudged much more easily than if you were right-handed.

The seemingly best advice I've seen is to learn how to be an "underwriter", aka position your hand north to where you're writing, instead of sideways. I say seemingly because I'm not willing to spend that amount in effort when I can write fine with pens.

The issue with being left handed, when writing a language that is written left-to-right, is the hand gets dragged over freshly written ink. A fountain pen has liquid ink that takes longer to dry than a ballpoint pen, it would make things significantly worse.

The thing about being left handed is your hand will naturally drag across the fresh ink of a fountain pen.

Fountain pen + left handed + left-to-right language is sadly a no go