How about writing by hand ON a computer?
For me is totally stupid to teach kids to type on a keyboard, when in the present and near future you could use other faster and better means for writing, like this speech recognition I am using now or stenotype.
The other day I saw a friend using a new prototype of a new digital stenotype on a maker space and I was sold instantly. This is the future.
But children need to learn how to draw, and train their hands in precise manipulation. If you lose handwriting training when you are kid you also lose the ability of doing precise work with your hands as your brain will prune the neural connections with your hand as you don't use it.
You can do that on a computer. Today we have affordable galaxy notes. I use an expensive Cinqiq, that will become much more affordable in the future. Training kids looking at the rear mirror makes no sense to me.