Just as some more info, the pitch comparison fail in that CRJ crash should have also showed an "EFIS COMP MON" caution message on the (EI)CAS, making it even more tragic that the flight ended up the way it did. Whether is was filtered from the PFD in declutter mode or not, they would still have a nice yellow message displayed. If I recall correctly, this is never mentioned in the report.
If anything, that crash should teach us all to take the extra second and gather information from ALL resources for a moment... That means not only standby ADI but do a quick crosscheck between both PFDs and check the damn (EI)CAS.
Yes yes, surprise and startle is a factor and this is all hindsight. Not here to appoint blame, just pointing out there is something to learn and to mash into your mind... Take the extra second.