I think nitpicker is confusing TAS with performance. If you're at a high TAS low level you're at a high IAS too and almost certainly outside flap operating limits. If you are at a high TAS because of altitude then you're about to change a high speed wing into a lower speed wing. And that's if you're even able to get flaps out (the limitation part of a LOIN check) at high level given your inevitable high IAS ( 240-260 kts on the A320 at FL360+). And yes I know the PFD is actually displaying CAS/EAS.