Just look at the history of credit card security.

It started with just having Name / Card Number / Expiry, all of which are printed right on the card, being all that was necessary to conduct a transaction.

Then they put a magnetic strip on the back of the card and storing the same information in plain text on that strip.

Then they started printing a "secret" 3 or 4 digit number (CVC) on the card for "extra" security.

Now we have chips in cards which helps with brick and mortar transactions in an era when most transactions are online.