@roulishollandais
I say it never enough : To work a dynamic system has FIRST to be observable and controllable. Stability, sensitivenes, robustess, optimisation, price, etc. come long after.
Observable and controllable. Yes, but respectfully, this is a bare minimum.
This is (must be) the state at DEGRADED. Whilst in cruise, the system, no, the interface, must be INTUITIVE, No? Unremarkable and fluid "get" without Stopping to think.
Thinking takes time, sometimes too much. Here is the fulcrum of the issue, as the system is challenged, reversion in mechanical and Human actions must be synonymous, and synchronized. No time for independent reversion, the machine into less control, whilst pilot reverts to "abstract". The partnership should not degrade whilst facing rarities, it must grow closer. Confidence and continuity come first, always. How Stone Age to stop the flow, retrieve a handbook, and start to study......