The only substantial reason to revive the Erebus story, is, if lessons aren't being learnt from it, and practised daily.
I think this has been done, and as Wally states, the lessons are being applied.
There's no point in denigrating the dead people involved in the decision-making and deceit, they can't defend themselves.
The truth of the events have been exposed due to the correct application of judicial expertise, mostly by one man.
The judiciary is there to find the truth, regardless of cost... personal or monetary.
The innocent dead deserve this at least, and the truth is required to be uncovered to prevent future potential disasters.
I believe this has been done, and the aviation industry has moved on with one more costly lesson learnt.
The benefit in raking over long-dead coals to try and start another fire is dubious in the least... with no immediate obvious benefit... and the suspicion that the book under discussion, is just one mans vindictiveness and bitterness at work.