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Not case hardening....
Just the local brush crew's preference for how
they liked their brush knives sharpened.

But, I have always wondered if a single bevel knife
could be improved by case...

In this case the machete steel was junk by our standards
and the temper nothing like an open razor.. I think they
used a dry grinding wheel with sparks a-flying but I was not
there.... I...

Two topics -- wire edge/ burr and stropping.

A wire edge is simply too fragile and uneven to shave with.
A micro burr/ wire edge will cut skin and collapse when
cutting whiskers. i.e. it will...