Hit the nail on the head. There's a lot of domain-specific units in use which aren't even imperial originally (fluid barrel, troy ounce/carat, ton of cooling,

Hit the nail on the head. There's a lot of domain-specific units in use which aren't even imperial originally (fluid barrel, troy ounce/carat, ton of cooling, horsepower, AWG) that will stick around for a long time since they're used so frequently in finance, planning and B2B transactions, along with other imperial units that'll remain because they've taken on domain-specific uses (acre of land, fabric yard, bushel, mils) even when the engineers and logistics folks touching that same stuff are using SI equivalents.