There was chatter about this in one of the NYC subreddits over the weekend. Apparently ending the de minimus exemption is closing the grey market for e.g. sunscreen; places that used to sell Japanese sunscreens on American shelves no longer are. There's a frustratingly long list of goods that the US decided to put requirements on in previous generations, and then stopped maintaining. Sunscreen is one; other countries…
I suppose an immediate counterpoint is that the US Consumer seems unwilling to clamor for high-quality products. :/