Is that not the point of a 50 amp socket? To say that you can draw 50 amps?

At the risk of saying something obvious, the socket and the breaker are sized for the peak load, not for average load. A typical home might have 300-400 amps if you total up all the breakers even though the mains are 200A or even 100A.

Also, a bog standard 14-50 is likely not suited for 80% steady EV usage anyway. They make EV-rated 14-50s now because people keep melting the older ones. And that happens even though the vast majority of chargers won't draw more than 32A on a 14-50 due to the historical popularity of using 40A breakers for a 14-50 receptacle.