Hardly surprising
If you've ever worked with security projects.
The Number one mantra, no matter what the clearance, is "Need to know".
Everything's broken down to units, each with its own design team and crew, and nobody knows anything about any other part, aside from inputs and outputs relevant to their own unit.
Power conditioning on one unit could throw it out of phase with the power conditioning of another unit it's supposed to be hooked up to. >KABOOM<
Another problem here is power phase labels. One unit could have them labeled ABC, another CAB, and another BAC, and another CBA, for example.
So when it's time to wire yours into the system, naturally, you'll hook A to A, B to B, and C to C. This leads to crossed phases all over the place, and when the switch is thrown, >KABOOM<!
And during troubleshooting, all the gear you're responsible for is designed to spec, it has to be somebody else's fault!