Absolutely true that, but it can also be a way to make your maintenance needs require exotic skills you didn't need before, such that your already-scarce hiring

Absolutely true that, but it can also be a way to make your maintenance needs require exotic skills you didn't need before, such that your already-scarce hiring tokens are stretched even thinner once that new person builds their thing and moves on. Which doesn't mean your point isn't valid, just that there is a flip side to it that it should be balanced against, and it is possible to err in either direction.