Quote:-
"Regarding pitot/static - surely a "safe" design for any modern aircraft is based on the knowledge and operation from many decades of aircraft design, so if this variant of aircraft has an inherent design flaw in this area it does surprise me."
Another Quote from Air France:-
"Without waiting for the in service evaluation, Air France decided to replace all its probes and the programme was launched on 27 April 2009."
Probably the second quote answers the first quote...There must have been inherent design flaws in the existing probes for Air France to launch into replacing them all...If not then you could say "If it ain't broke then don't fix it".