Darryl Ramm wrote:

If the threat aircraft you are worried about are on flight following
(i.e. they have a transponder and can be seen on radar by ATC and have
bothered to actually contact ATC for flight following) then by
definition you are both likely to be in radar coverage and ATC should
be able to provide traffic advisories under flight following.

The above phrase "should be able to" is correct. ATC in the U.S. is only
required to provide VFR traffic advisories on a "workload permitting"
basis. If the controller has his hands full with IFR traffic, you lose.
Remember that lots of people file IFR on perfectly good VFR days.

Tony