My previous code shop maintained a fairly large rails base and we mitigated that risk by doing as many things "the rails way" as possible, even if it took more time than some ruby hack.
When you consider how quickly new hires could pick up the project, it easily outweighed the extra effort designing code in a well-understood format.
That's very similar to a philosophy I have about feeling pain all the way up to the decision maker.
If the decision maker (project manager in this case) doesn't feel any consequences for their decisions, then they won't have any incentive to make good ones.
It's a meatspace demonstration of the CLT.