I'm specifically talking about the Spore Drive. The classification of the Discovery is a good reason for Spock having never mention his Sister. But as a reason that Starfleet has abandoned the Spore Drive? Come on seriously?? Starfleet abandoned the whole thing based on the classification of one ship? Surely the entire Crossfield class is Spore drive ready, could one of those of not took over? Sure they lost Stamets too but could someone else not pick up his work??