You're better off with air-dried than kiln-dried,
but the regulations don't recognise anything other than McTimber
that's shoved through a kiln in the vain and pointless hope of turning
it into a homogeneous and consistent material.

I think a single kilning at source works fine, even below "air dry". The
problems arise with secondary kilning when timber is dried once for
shipping, and then again by McTimber to quickly comply with some regulation
or another.