Also, even in the future, the power will go off once in awhile. Hand-writing would be like swimming. Not necessarily used much, but a skill worth keeping.
Anyone who uses the latin alphabet will have the character shapes memorized, so I'm sure they'd do just fine for emergency use even if they'd basically never written before.
That said, a huge amount of handwriting curriculum is actually motor skills practice, and that's pretty important!
It's also free-form. If I want to include a sketch or some math, it's easy.