One kid in my school didn't write cursive, but wrote block letters so beautifully, it looked near printed. And he was probably faster than most. He also played the piano since young age and is a professional pianist now, so yeah :)

So I would totally put it on the same level, theoretically. That is, you can write block letters with just as much skill and care as you can cursive, I think. Just like you can write cursive by just doing squiggly lines (as doctors write prescriptions).

I'm definitely not a pro, but I've been actively playing piano for forty years now for whatever that might be worth.

Sounds like you remember that person because they were exceptional. That doesn't make them a good argument for the general case.

Smooth curving lines connecting into each other are very different from intersecting straight lines with clear stopping and starting points.