I think this flight was operated so badly in almost every respect that there is very little to learn from it. They started with a perfectly serviceable aircraft and managed through complete buffoonery to destroy it and kill all but one person on board and several on the ground, not least by ignoring every good aviation practice and all of the warnings given by the aeroplane.
Non-existent CRM blended with total disregard of SOPs and ATC is a very potent cocktail. There were many, many points during the approach where they could have broken off, set up for another one and none of the rest would have happened. About the only positive in this accident is that it triggered a far-reaching investigation which may have saved more lives in the long run.