When I got my first credit card, circa mid-90s, no one told me I had to sign the bank. Took my brand new card with my brand new girlfriend to a shop and bought something.
Handed the clerk my card during payment, she looked at it and said it is not signed so she is not allowed to accept it. I took it back, she gave me a pen, I signed it and gave it back to her.
She ran the transaction, got an approved slip, gave me the slip to sign, I signed it and gave it back.
She compared the signature on the slip to the signature on the back of the car, and Lo And Behold, They Matched!
I personally don't mind this because I've been burned too many times by services that mangle a new password in some invisible way, for example silent truncation, so I like the opportunity to log in just to make sure that the update has worked, the value in my password manager is correct, etc.
Handed the clerk my card during payment, she looked at it and said it is not signed so she is not allowed to accept it. I took it back, she gave me a pen, I signed it and gave it back to her.
She ran the transaction, got an approved slip, gave me the slip to sign, I signed it and gave it back.
She compared the signature on the slip to the signature on the back of the car, and Lo And Behold, They Matched!