Are you sure it's about national IT security, and not just about sticking it to China because we're in a trade war with them?
Huawei has set a historical precedent of being a bad actor in regards to corporate espionage. How outlandish is it to think that they would also be participating in national espionage for the Chinese government?
Can you point to a specific example? Why was banning not done via the standard arbitrage?
How sure are you of a framing which separates information security from economic conflict?
I remember watching a video about how old/antiquated the technology used by the IRS is (i.e. a behemoth computer system built in the 60's)... Our government's IT infrastructure needs a massive overhaul.