One concern I always had was at the woeful weather radar. That really isn't good enough for the 21st century; many of us experienced lightning strikes with no threats showing on the weather radar, for example.
The same can happen with these new "software enhanced" radars, it's all in the interpretation and experience.
Being from down under, the VC-10's "footprint" never ceased to amaze me on my visits to family near Brize. Long live the 10, even if on the ground.