N95s are used in many industries, and it’s a liquid market. Not hard to call up a big industrial distributor and say “hey, we have these masks that expire in 1yr, want to have a sale?”
Too many people were buying up shops of marks and sending them back to China. That hurts us even more.
If the goal is pandemic preparedness, it would probably be most efficient to just build and mothball production lines, doing limited runs yearly to exercise the machinery.
The government has more than enough land and warehouse space.
As far as I understand, none of the components (or machinery to produce them) are particularly cutting edge... just limited because they were sized for pre-pandemic sales volume.
The only responsible excuse is incompetence or negligence. We, the USA, were completely unprepared.