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> (Such that lumber is sold in lengths of 243.82 cm rather than 8 feet.)

It's interesting that you pick that example. In many cases, the "measurements" for lumber don't actually correspond to the true dimensions of the product purchased. For example, a "2x4" has dimensions of 1 1⁄2 inches x 3 1⁄2 inches[0], rather than 2 inches by 4 inches. So, at least for the example you give, it's not clear to me that converting to metric is a bad idea, since the specifications are already somewhat nonsensical. Granted, a "2x4" does have a standard size.

[0] https://en.wikipedia.org/wiki/Lumber#North_American_softwood...

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Having worked in construction, I think it is the last point you make that is most important. Though a 2x4 is 1.5x3.5, it is a standard dimension. In the US, construction standards (lumber sizes, door frame sizes, ceiling heights, etc) are all in feet and inches. Changing them creates a compatibility nightmare. That said, I don't know of other industries that suffer the same challenge (perhaps others can think of them). Bicycles for examples transitioned reasonably quickly from English standards (e.g. 1 in. stems and 27 in. wheels) to fully metric for road bikes at least.

Oddly enough - Depending on the market, European plywood is sold as 125x250 cm sheets, but when you measure them they can be a bit larger.

When you measure them - they're exactly 4 x 8 feet as if they were for Americans.

It's also why you find a lot of 10mm 13mm and 19mm bolts that suspiciously also fit 7/16 1/2 3/4 inch sockets.

It is not nonsensical, 2x4 is the rough sawn size.

Edit: Since I can't reply because of HN's helpful 'You're submitting too fast' notice, I will reply here. You can still buy rough sawn for working on existing structures and for aesthetics when exposed.

I don't have primary source info, but from the wiki article I linked, that used to be the case, but is no longer the case. All that matters now is the final cut dimensions.