[whstl]

It's not really anyone saying "you're doing the task wrong", it's more like "you're doing it only so slightly differently that we need a few months to write customizations for it. We'll send you the bill".

Those big ERPs are not really blank canvases, but when you need those micro-customizations in the wrong place, they can become one.

End users involved in the integration don't really want to learn new processes or even do things slightly different, as they know that changing process often involves burning a lot of political capital and they often lack awareness to know that "just using the ERP the way it's intended" is cheaper. And consultants are experts in finding a chance to perform those micro changes. It's a perfect marriage.