> So they will rightfully advise business operations adapt to the ERP template, rather than the other way around. They know full well in advance you will end up not following that advice as the changes would be enormous and lost functionality as compared to the previous system

There's an additional catch to that old argument as well. If you actually do what they say, and stick to all the templates. Well guess what, they're all going to change with next update as well and now you need to change all your business processes at the same cadence as they happen to update their software. You still have to adapt to the changes of the system, it's just not the IT departments problem.