localised heat damage/csorching from ECS packs/leaks!
I love the way inventors/dsigners think aircraft operate "as it says on the tin". Have a look in the panels of a 15 year service (well looked after) ailiner and see the scars of leaks spills, tooling damage etc that naturally occur.
How would it stand up to this?
Carrying the extra weight compounded to added initial expense and in itself creating another maintenance item to be inspected etc.
Oh yes, it'll be on every jet soon.
In Dragons den Parlance, I don't like it and for that reason - "I'm out"