Just adding to speculative theories but I had been almost caught out in the sim once in a SFO slam dunk scenario...high and fast on base, so we had speedbrakes deployed full, then 3/4 way where we left it there as we completed the checks. Got onto 3degrees flight path at 500' AGL, but despite the more than normal setting, the aircraft just sank like a rock as we decrabbed due to a stiff crosswind. Went around and then noticed that the speedbrakes were still 3/4 deployed!!! Oops, double oops!
Oopsy daisy...we were overwhelmed by the slam dunk approach and also the anal procedures by the airline which required the PM to set runway heading, mouthing off " general call outs " to ensure correct runways as there were 2 parallel strips, ATC calls. Somehow we missed the EICAS warnings about speedbrakes. Well, that workload overload for you!