Our project managers are salespeople, they over promise our capabilities, mostly because they don’t even know what we can do, and disappear the moment a contract is signed. Leaving it up to the employees who actually do the work to meet impossible expectations.
There’s been a few good project managers who get involved and check in on things, but there’s only been one (out of a dozen+ or so) in my 7 years working here who’s actually asked us what we can do and how long things take before taking in contacts. I’m sure they, or at least that kind of approach, will not last very long.