One reason I started the thread is that my wife encountered a twenty something who was practicing her signature because her new job required her to write checks. The woman had a friend write out her name in cursive so she could learn to copy it. The woman had almost no experience at all in signing her own name.
As for me, I learned several years ago to be just as sloppy about signing the back of my credit cards as I was most of the time. I would get the hairy eyeball from cashiers when my signature din't match the neat writing on the card.

Of course, with chip cards, no one cares anymore.