A similar problem I've seen a few times are the consultants that participate only in the first few months of a multi-year software project as architects, so never get to experience the long-term implications of their design and the mess they prescribe. Not only is this bad for the project, but also breaks the feedback loop for their own learning.
This is something I'm afraid of at my current company.
We just used 3-5 contractors to implement Zuora, Salesforce, and Netsuite in "record time". They're gone now, along with the biz ops person leading the rollout.
As an engineer, I feel like I'm eventually going to have to deal with that flaming pile of shit.
