Not sure that’s true, I used to work with a right-handed Pakistani person who was fully bilingual in Urdu and English and they claimed their handwriting was neater in Urdu than English. I couldn’t tell because I can’t read Perso-Arabic.
Although it’s also possible that RTL writing systems like Perso-Arabic are designed in such a way that it’s ergonomic for the right-handed majority of the population to write in.
It’s an interesting topic, wonder if there are any papers on it
I think it is easier because the length of unbroken long lines isn't as long as in cursive Western writing. So they aren't push-hop-push-hop their way through long unbroken lines like we are. Lefties often prefer printing for exactly that reason. It's slower, but at least they can read it after.
Although it’s also possible that RTL writing systems like Perso-Arabic are designed in such a way that it’s ergonomic for the right-handed majority of the population to write in.
It’s an interesting topic, wonder if there are any papers on it