Ahh, rough sawn versus dressed.

Deeply frustrating when you assume sizing matches description.

Even rough sawn is not 2" by 4".

Americans love inventing field specific nomenclature. Like piping sizes, wire sizes, metal sheet thickness, plywood router bit size, construction wood size, furniture/raw wood size, etc

I have always thought it was just a side effect of capitalism. The more messy the units, the harder it is to enter a field without requiring the help of an expert sales.