Zeffy,
The HUD is nice for some things but it has limitations. Even while the HUD is deployed your scan, IMO, needs to include the lower displays.
I doubt that the HUD will be an issue in the investigation.
High visibility, 360 degree FOV, canopies are great in fighters. However, there are problems with that visibility when flying IFR or at night on approach. Advances can have drawbacks. It's the total value that's important. The HUD is useful, but not 100% of the time.