GMDS, are you referring to tactile feedback as PF or PNF? As PF feedback is a non-sequiter, after all you are providing inputs to an hydraulic or mechanical system (in the case of non-FBW) or a FCC in the case of FBW. Any "feedback" is only control system resistance. If you are an IP or a PNF monitoring a manoeuver then how do you get tactile (ie perceived by touch) feedback unless you have your hands on the control column and are inducing the input yourself. You can perceive column position by visual cue, or physically if you have your hands on the column, but not tactile feedback. Not much different to a Bus SPI. Anyway, I will withdraw to my position of saying that I have experience of both systems (except Boeing FBW) and that after a short period to adapt (either way) the same basic principles of aeronautics apply. As someone else observed, it is possible we are missing out on the best system because of the fact that airliner design is now in the hands of two large concerns that are often hindered by their own history. For instance, I always preferred the DC9 to the 727. "Tactile feedback" through that trim wheel I found a little overwhelming (being similar to a pulley wheel on a steam driven farm implement), compared to the trim position indicator. But these days no more Douglas, Fokker, Lockheed etc. What might have been!
Also:
One very fundamental characteristic of the information processing system requires mention. Although man has a vast capacity for sensing information, the decision making stage of the process consists of just one single channel. In other words, although information may be sensed from the approach lights, the altimeter, airspeed indicator and ATC, the decision-making channel is being time-shared between the different inputs.
(Broadbent, 1958; Poulten, 1971)
- So, while one piece of information is being processed, the others are shunted temporarily into the notoriously unreliable short-term memory store to await available time in the single channel. When time becomes available, they are retrieved from storage and despatched on their way. Many factors affect the efficiency of this storage and retrieval operation and a source of potential error is revealed. While it is often felt that one can do more than one thing at time, this subjective feeling results from the rapid scanning and time-sharing which takes place between one piece of information and another.
GMDS, you are a very rare person indeed if you can process through parallel channels!