Project managers can add a lot of value by zooming out and finding dependencies that would slow things down. The less obvious ones, especially chained ones.
How often do they, in your experience? From my perspective, the only ones discovering and calling out dependencies are senior engineers (or higher) either during planning or during active development, as the PMs are blissfully unaware of how anything's actually connected, even if they've been handed architectural diagrams on a silver platter.
