I still don't understand how reputation cannot be verified on the blockchain, it's not a metric that is tied to each individual account? So I guess the questions would be why is it not the case with reputation, and how is it not the case, unless I somehow didn't get the premise of reputation correct, it being a metric that is tied to each individual account.

Let's assume it is, then it can be used to limit operations, and it should be, because without limits we have no way to counter abuse, and limits require absolutes, while people aren't absolutes, it's not the point of who's a sinner or a saint then.