I tend to agree with this. If UML or something UML-like offers value in terms of understandability at some level of abstraction as a substitute for needing to h

I tend to agree with this. If UML or something UML-like offers value in terms of understandability at some level of abstraction as a substitute for needing to hold the detailed mental model of the entire explicit implementation in one's head, then using it as something extracted from the implementation to provide a simplified sketch of it makes more sense than using it as an input artifact to creating the implementation.