long time ago, in one small company, i wrote an accounting system from 1st principles and then it was deployed to some large-ish client. It took several months of rearranging their whole workflows and quarelling with their operators to enable the machine to do what it is good at and to disable all the human-related quirky +optimizations -cover-asses. Like, humans are good at rough guessing but bad at remembering/repeating same thing. Hence usual manual accounting workflows are heavily optimized for error-avoidability.

Seems same thing here.. another kind of bitter lesson, maybe less bitter :/