WIND FACTOR -
Of all the reasons to cancel the flignt was the wind factor. Having a momentary legal wind report doesn't diminish the high probability of encountering a fatal wind shear until being able to accelerate to approximately 250 knots. That's quite an exposure window.
The range of wind reports with no suggestion that the wind could be expected to either stabilize or improve for hours to come should have been considered - by the whole crew.
As the evacuation showed, the aerodynamic capabilities of the aircraft, crew and their luck won't overcome the non-controllability of the excape slides in high winds.
Not mentioned also is the propensity for the downwind engines compressor stalling in high crosswinds. Remember the SFO 747 incident that nearly took off the hilltop, as well as the Gatwick 747.
There should be no doubt that the crew would now tell us that given the same situation, they would wait out the weather. They are the experts.