> Design the process from the bottom up

Bottom up IT system reimplementations fail much more often than incremental ones.

Bottom up reimplementations of operating human systems that also involve big bang IT implementations are even worse, by comparison to incremental evolutions, mixing incremental automation with incremental process improvement.

And it usually only takes one high-profile failure of a big-bang implementation to derail a broad reimplementation process, whereas the occasional incremental setback on an incremental improvement process is rarely politically significant to the overall process.

So, no, I disagree with your recommendation that this should instead have been done with a more waterfall-style approach.