It's just not very practical to type everything during class.
Why not? Lots of kids do (including both of mine).
It takes some practice to get up to a decent speed, but after that, it's a huge relief for the kids. For years, our school didn't provide AT, so we just sent in a cheap laptop ($100 or so should get you a refurbished Chromebook-type laptop - small enough to always be on the desk/ in knapsack, and boots up immediately). I suspect that huge amounts of practice to improve his writing may create much misery, but have limited effect, especially in the longer term. Dysgraphia doesn't fix easily, but it's readily by-passsed with a keyboard.
