As I see it the recent sensor discussion highlights two elephants in the room.
So we have, on the face of it, an aircraft with out of date optical technology, that is however as was specified, that the software integration of has yet to be proven.
The processors in the systems may well have been top of the range one day but are far from it now, so to keep everyone happy it could be argued that a change in specifications of the sensors, processors and thus software is required, trouble is this would add a number of years and yet more risk to the development program.
Or has this all been covered by concurrent development, I think not.