Good point. The issue is, according to OP, that they don't yet know how to calculate the correct amount for new rules going into effect in 3 days, or at any rate have that knowledge implemented into their systems.
End of de minimus means you have to calculate taxes on a lot more packages; but you have to know what the tariffs are to calculate them, and it seems like that's been going all over the place, and could change again at any time?
But the congress passed the bill to permanently repeals the legal basis for the de minimis exemption so no more TACOs. And I love TACOs…