> It used to be that tellers would compare signatures from the back of your card to the signature you just scribbled on the receipt to ensure it was really your card.

I'm in my mid-20s.

From the time I signed my first debit card and ID card at around 16 to my driver's license at around 18 my signature already significantly changed, not to mention that I rarely if ever have to physically sign something on paper forms and the like so it's not uncommon for there to be months or even more than a year between signatures. How am I expected to replicate my "signature" almost exactly?