Dozy, in your analysis (#1107) you might have overlooked what question ‘interpretation’ was asking.
‘What is the accuracy of reading the speed value’ vs time is not the same as understanding the speed value in context, task, limit margin, rate of change, manoeuvre capability, altitude effects. As per FDG135 #1112.
Also, for context we should consider the background assumptions in design and operation; With/without auto flight, accuracy demands, workload, automation policies.
Airbus favours the use of automation as an entity; the accidents relating to this are dominated by system failure cases.
Boeing opt for flexibility, the pilot can choose, but not always with appropriate training or guidance to limit the situations which might be generated; thus accidents more likely involve operational implementation.
Also both manufactures have encountered the parallel problems of automation dependence; this involves much more than design or policies, individuals, etc, but also the changing operating environment and assumptions made by the planners.
With the Next Gen of GA aircraft, with tape EFIS, but perhaps without the same extent of automation, particularly autothrust, or even more so the lack of guidance and training, then whatch this space … Clandestino (#1121).