I doubt that FAA has much interest in where that line is drawn, as it doesn't appear to bear very much on their charter to maintain order in the airspace that is occupied by regulated aircraft.
That line is one of the ways FAA dictates what craft/pilots are required by law to have FAA licenses and certs for their UAS:Civil
from other craft/pilots that are not required to get them for their UAS:Model
Policy11 made it clear that line decides which way you are authorized to use the NAS, as a
2.Civil (certs&license req)
or
3.Hobby (no cert/license req)
kind of UAS
If you are commercial then you aint 3.Hobby
in the eyes of the FAA, and you dont get to ignore the UAS regs that Hobby gets to ignore