A bit of hyperbole is going on here.
Point 1) No one stops buffs from flattening airfields and towns anyway. So unperking this plane will not change how often fields and towns are laid ruin.
Point 2) 12K of ords is less than
one Lancaster.
Point 3) No one catches any 28K bombers.
Point 4) At 10K the MossieXVI will be caught by every Dora, Pony, 109-G14, 109-K4, Tempest, Typhoon, F4U-4, La7, Spit16, Spit14, Ta-152, YAK-3, Yak-9.
Perks are designed to limit plane use to some target level. What is the target usage of the Mossie16? This discussion should be usage based not performance based. Perk Cost is a tune-able parameter that needs constant tweaking. If usage is below target usage, than the perks should be lowered or even eliminated (like the Spit14).