The ancient Romans had one design for bridges, aqueducts and large load bearing walls and it worked great. Many are still standing after generations of war, natural disasters and neglect.
And they were/are aesthetically pleasing.
This “bridges as art” crap is going to get people killed.
Yup, looked great, functioned great, endured. What more does there need to be. The uniformity of design not only makes things easier it also makes them look better and lends to a sense of solidity of the empire.