The Block-3 has been fundamentally redesigned from the grounds up
The ‘electro-mechanical system’ is an umbrella term that encompasses the entire fly-by-wire system including full-authority control of the engine, control surfaces, and the actuators used in them. This has immediate implications for the flight envelope. Also checkout messiach’s recent post hinting about changes in flight performance. Finally this also encompasses the ‘feel’ of the controls for the pilot through sensory feedback.
This is why I am waiting to see an actual video.
A private viewing can showcase the holographic HUD as well. A normal HUD paints information in 2D. The holographic HUD can paint waypoints, enemy combatants, and firing solutions in 3D.
Finally, with Live Virtual Construct, the aircraft IS the simulator. What you would do with a simulator, is now done with the full flight experience of the aircraft. LM is living in the past and you seem stuck to their backside.