When you are typing, the same simple movement of your fingers is involved in producing every letter, whereas when you’re writing by hand, you immediately feel that the bodily feeling of producing A is entirely different from producing a B,” van der Meer says.
It never crossed my mind that typing letters out instead of handwriting can take away from the muscle memory of it. I think kids are definitely affected if they cannot write the letters out. Also, I think it is interesting how we can subconsciously type on a screen, but it is a completely different feeling when we physically write.