Crab,
The flight/nav system unfortunately does not work in isolation and it is/was the overall computing power of the aircraft that was the limit. Future iterations with more powerful computers and this will not be a problem I suspect. A capability was needed that had limitations but was still far ahead of other fleets.
A remarkably accurate summation of events as it happens!
What the Apache has that others do not is wire cutters, a cracking advert for wider use, it has paid for itself in this one incident alone