My handwriting changed after getting used to Grafitti. I still mark Xs on forms with the symbol for X (like the K, but mirrored). This is over two decades after the fact.
To this day, trying to hand write an e when printing quickly?
Your hand still does a double joined c.
And a T is written like a 7.
It's amazing how the muscle memory stays with you.
It was so simple to learn, and stayed with you.
Swype is the first phone writing technique, that has beaten Palm.
> It's amazing how the muscle memory stays with you
It is because it made sense. Not just a convention, the graffiti gestures are a convincing set of compressed (minimal full information, simplest one line per character) glyphs.