I am aware of this issue because I assign my students essays and they are unable to write them by hand because they weren't properly taught --- or taught at all --- and further, have never been required to write in cursive since they first learned it. Without practice, the skill deteriorates.
Their essays take longer because printing requires the hand to be lifted after each stroke, slowing the student down considerably. I have told them, since so many of them are close to college age, they will have trouble in college trying to get enough information down in their Blue Books at finals time.
Many do not even know how to sign their name. I've told them that is dangerous. A signature is essential to an identity. Printing on legal docuмents can more easily be copied than a cursive hand. Some students I have had to teach/re-teach myself.