There are keyboards, but usually computers/tablets/phones are banned in class. Our high school did not ban laptops on lessons (it was a very liberal school), but few people used them anyway. Then there are tests, solutions in which can also get too long to quickly write without cursive. Even here, teachers did not accept assigmnents and tests in a typed form, except during remote learning. Not to mention the formulas, which would be troublesome to type out, doubt kids would be fluent in LaTeX.