100% of that is based on someone changing a breaker based on "assumptions." Literally going in and unhooking a wire from a breaker, not looking at that wire gauge, and putting a bigger breaker in. None of this is based on memory, the wire gauge is printed right on the wire. Totally illegal and stupid. If we're going to protect against that, why not keep going? I mean, the old Tesla Wall Connector is rated for 100A, so they must all be wired to 100A, right? Weird that there's a 40A breaker here, let's just swap that out....
Meanwhile, undersized breakers for outlets are totally legal. You can make up "best practices" all you want, but actual required practice is to check the wire gauge and all outlets on the circuit before you arbitrarily change breaker sizes because you feel like it or are forgetful.