What's interesting to me is Sutherland's permitting of grease to be used on the bolt threads, but does not require this. This seems to me to be a huge variable left up to the installer, who has no test data to determine which is the more appropriate for use with the prescribed torque value.

Similarly, Barnett's allows the use of a liquid locking compound, which I am near certain would act like a lubricant during the press-fitting process. Again the installer is left to make the choice.

Is Campagnolo the only one who clearly specified the terms of assembly regarding both the bolt's threads and the spindle tapers?

Another curiosity is the torque specification for spindle nuts versus bolts. The nut's larger thread diameter and greater thread pitch both contribute to less axial force being generated in response to any given level of torque, but I don't recall that a different (greater) torque level is prescribed for them.
I always torque the nuts twice, before and after applying exaggerated rider weight to the pedals with the cranks held horizontal, since extra torque on these nuts often fractures the threads on the spindle. A greater level of press-fit is thus achieved without risk to the spindle's threads.