My take is that product managers care mostly about what functionalities were delivered and if the requirements are met. If the development teams deliver a quick and dirty solution and it meets some requirements then they check the requirement as delivered, and that's it.

When this happens then the devteam's negotiating position changes completely, because they are no longer arguing about how to allocate resources to deliver a functionality and instead they are asking to waste time rewriting something that was was already delivered and is supposed to be up and running.