FPV is not actually illegal because that document also states:
Part 107 does not apply to model aircraft that satisfy all of
the criteria specified in section 336 of Public Law 112-95.
and the criteria specified in section 336 of Public Law 112-95 is:
(1) the aircraft is flown strictly for hobby or recreational use;
(2) the aircraft is operated in accordance with a community-based set
of safety guidelines and within the programming of a nationwide
community-based organization;
(3) the aircraft is limited to not more than 55 pounds unless
otherwise certified through a design, construction, inspection, flight
test, and operational safety program administered by a community-based
organization;
(4) the aircraft is operated in a manner that does not interfere with
and gives way to any manned aircraft; and
(5) when flown within 5 miles of an airport, the operator of the
aircraft provides the airport operator and the airport air traffic
control tower (when an air traffic facility is located at the airport)
with prior notice of the operation (model aircraft operators flying
from a permanent location within 5 miles of an airport should
establish a mutually-agreed upon operating procedure with the airport
operator and the airport air traffic control tower (when an air
traffic facility is located at the airport)).
This is essentially saying that if it is a recreational drone, follows community guidelines, is not more than 55lbs, doesn't interfere with manned aircraft, and notice is given to airports before flying within 5 miles of them, that FPV is perfectly Legal