Curious what efficiency improvements are enabled by standardizing on married surnames. Maybe nurses at hospitals never need to request to see your marriage lice

Curious what efficiency improvements are enabled by standardizing on married surnames. Maybe nurses at hospitals never need to request to see your marriage license if you have the same surname? And besides that...? This is coming from a somewhat anecdotal place. But as a married person in the US whose partner didn't change names, it's not been an issue at any point in the last 10 years of marriage. Not once have I had to explain to someone "oh yeah, we're legally married." If anything, in our case so far it would have been inefficient for us to go through the time filing paperwork to get one of our names changed to the other's. Which, is exactly why we never bothered in the first place. What a waste of time (in our eyes.)