Agreed but id go a bit further with intent. They are intended to be punitive to the process of manufacturing warehousing order packaging and shipping individual orders in overseas warehouses. I'm not sure if USTR (us trade relations) has the same or container specific rates on bulk imports but a pallet or shipping container eating the tariff across all of the individual units in that pallet/shipping container is much more reasonable and then would be warehoused domestically where a domestic tax paying warehouse+employee+shipper would be responsible for storing the whole thing along with assembling packaging shipping individual orders. I remember those jobs existing when I was younger and even remember high school acquaintances in classes like print shop making board game boards in class, it's not rocket science to do some of those things.
Not sure I got the whole chain before your post but I think I can shed some clarity on the question you seem to be asking. The tarrifs are intended to make it harder to have foreign manufacturing warehousing fulfillment and shipping, switching to domestic alternatives is more costly, and potentially very difficult yes, but that's where the USTR port fee changes come in to adjust things with a somewhat sweeter pot. I'm not positive how far those port fee changes have gone from proposal to settled but pretty sure that process is moving along solidly enough to result in things like shipping companies ordering new ships to be built from domestic US shipyards. There are a lot of factors involved but here is a great 4 month video about the original proposal
