They're not doing on-the-spot signature analysis. You're just harming your own chances of getting a dispute resolved in your favor if you ever need to make one.

They're not doing on-the-spot signature analysis. You're just harming your own chances of getting a dispute resolved in your favor if you ever need to make one. When you have a documented history of legit signatures on file, signature difference is one of the factors that get considered in the event you file a dispute.