As I recall (from a few years ago) the report into the loss of the MPL concluded the problem was a misreading of a transient Hall effect, which occurred when the legs opened in the final landing phase. Apparently this was interpreted by the onboard computer as "we've landed - turn off the engines" and the MPL crashed to the surface from a hundred meters or so (?). So an imaging of the site should show the heatshield, parachute, and debris consistent with a fall from that height under a third Earth gravity. Checking that out would be very useful for validating investigative techniques, which in turn must relate to an overall understanding of the mission architecture. - We really want to know if they were right or not ..

Similarly people want to know what happened to the Beagle. Did it make it to the surface in one piece? That would mean the heatshield design was OK, which is important for the Brit designers to know, I would think.

Yes EDL would have told us everything and it should have been included. It wasn't and so hopefully we can use Hirise to validate our guesses. - If that's a waste of time, then why bother imaging Opportunity?