Enterprise software PM here: this is wrong. Customers absolutely ask for complexity. They may not say "give me a complex piece of software" but they sure do provide an onerous list of requirements, plus they need you to meet their security/PCI/HIPAA/whatever other standards. Then over time their needs change and they need the software to change (or worse, they need to be able to make changes to the software themselves, so you have to build in flexibility).

This is like saying customers don't ask for wheels and a motor, they just ask for a car that is capable of driving.