It's important not to lose sight of the fact that the UAS situation triggered by the pitot tubes was simply the initiating factor. Far more central to the case is the question of why crews were insufficiently trained to handle such a situation, and a proper investigation into human factors - namely how a qualified pilot could become so overwhelmed by the situation that they do precisely the wrong thing consistently from onset to impact.
Well you have the answers in your own message
UAS was considered a relatively minor problem by the industry as a whole.
So .. why a extra training for what was considered by the whole industry as a minor problem ?
A extra training was put in force "after" the accident .. as contrary of the general idea .. the UAS is no more considered as a "minor problem"
Note that some had warn long before the AF447 case that a UAS was not a "minor problem"