To me, none of what you mention requires a whole lot of consistency other than in as much as we understand that we are horribly inconsistent we have a whole lot of ceremony and processes built up around what we do to mitigate the wild inconsistencies in the quality of work we do.
> How does the financial industry work? How are people comfortable executing transactions?
Because there are serious checks and balances? Because of double entry bookkeeping, reconciliation, audits and, ultimately, prisons? Systems of governance put into place with the explicit goal of ameliorating the vagueness of individual humans?
Aren't you mistaking the state and ability of being consistent, with the incentives for consistency? All these systems of governance would ultimately be useless without the ability to conform to them. And conform we do.
Maybe the ambiguity in this discussion is how to distinguish consistency from conformism?
How does the financial industry work? How are people comfortable executing transactions?
Do you generally rely on your bank account to not randomly fluctuate in its balance without cause?
Do you work in the tech industry? Do you rely on computers and algorithms and software to do things humans promised they would do?
All of this requires a very high level of consistency either in humans or in tools they have created.