Sorry, but 3 pairs of eyes could and should have seen/scanned/observed the (negative) speed-trend!
Absolutely agree with this. I am very concerned about the level of automation complacency that has crept up on some professional pilots over the years. Many airlines now mandate 'maximum use of automation' rather than 'appropriate use of automation' and this doesn't help with the above problem.
It's just interesting that at stick shaker activation on the accident flight, recovery was always going to be a challenge, to put it mildly. I say 'interesting' but the whole thing is a bloody tragedy. Let's hope some very important lessons are learnt by the industry.