Big lessons
I think some posters are missing the point.
What we need to learn from this accident and others, is not who (or what) to assign blame, but how to improve the entire aviation system to prevent future accidents.
Don't be distracted by mechanical minutia and miss the larger lesson. If the flaps and slats were not extended and the crew announces that they are set (by rote memorization of the checklist) the problem is not with the individual crew, but with an aviation system that distracts and pressures the crew to hurry and make bad decisions.
Most pilots have been there. Delay, delay, delay. Then suddenly hurry to make the assigned takeoff slot and woe to those who taxi too slow or run the checklist as slowly and deliberately as they normally do.
I truly hope that both pilots are exonerated of all wrongdoing, but if the investigation shows they made a mistake, I understand completely having endured the crucible of five airline bankruptcies in twelve years.
It is easy to get distracted.
doodahdave