i think this is under-emphasized for people unfamiliar with them.

I think SAP and related modules are "solidified business processes", and their consultants and sales persuade your CxO level people that switching business processes will improve overall efficiency (and somewhat hint at standardization, so that the CxO will have experience at that domain when switching jobs!).

But of course, it's not really true - best practice business processes are an illusion imho, and it will turn out that the subtle differences have to be implemented individually.