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I use fountain pens in my daily life and don't touch cursive (although my handwriting has some elements of it). It's a misconception that cursive was made for fountain pens.

Rather, cursive evolved because it was faster to scrawl words onto paper without lifting up the pen, and the formal version taught in schools was essentially a prescriptivist version of a quick scrawl. It was invented to help you write faster.

In particular, I've heard the myth that if you lift a fountain pen up, it might drip on the paper, so it's better to write in one continuous motion. Fountain pens haven't been leaky for the last few hundred years (when well-maintained). By contrast, ballpoints used to leak tons of ink before precision manufacturing and plastics became cheap.