What we know is a true-ism: history tends to repeat itself
SB not being made mandatory contributed to a tragic accident (airlines not faultless either for not making those recommended changes). Pilots fighting against their machines after mishandling of a vital control and not understanding what their predicament was. Congonhas wasn't the first and unfortunately probably won't be the last. But more attention needs to be paid to make a good product better.
read PBL's article here regarding the 1994 CAL A300-600 crash in Nagoya
(scroll down to 1994)
http://www.rvs.uni-bielefeld.de/publ...ei/taipei.html
Does anything sound familiar?