I struggle to think of what that extremely secure infrastructure would look like. Are you imagining signing on an electric terminal and having a computer compare signatures at the time of sale? That seems like the most secure and still wildly insecure compared to a pin.
Do you think signatures were at all secure? If they cared about security they’d do chip+pin like most civilized countries.
With proper infrastructure yes signatures are extremely secure. But that proper infrastructure doesn’t exist.
I struggle to think of what that extremely secure infrastructure would look like. Are you imagining signing on an electric terminal and having a computer compare signatures at the time of sale? That seems like the most secure and still wildly insecure compared to a pin.