You want to make an ERP vendor (better: the ERP implementation consultants) sales rep nearly slip into a coma thinking about the giant boat they're going to buy with the commission check? Tell them "we're a special snowflake company with our own magical business processes, and we need you to adapt your software to our business. Because we know more about business than you."

You probably don't. And even if you do, adapting your business processes to how the ERP does it will probably make things like inter-operating with other vendors and managing compliance much easier.