I don't know if I would call that an example of siloing. I think that's an example of the fact that a deputy head is considered the accounting officer of their department.
We are siloed in the sense that every department has an accountable head—the deputy head—and the accounting officer makes these decisions and is responsible for them. You set up your own mechanisms to ensure that you follow policies. However, when there's a central agency like Public Services and Procurement Canada, and you're not using them and seeking out their expert advice and guidance—in this case, on procurement—you're missing out on an opportunity.
There isn't always an obligation, because whether or not you need to go to them is set by dollar thresholds .