I frankly think that the FAA should require that instruction for the
IFR rating be done by CFII's who are IFR current. There are too many
CFII's out there not even able to accept an IFR clearance giving
primary IFR training. A lot of them may (or may not) have tons of
previous IFR experience. But really, it is real world IFR flying where
you pick up the ATC experience. And it is experience with ATC that is
the bottleneck with IFR flight. If you listen to hangar talk from
recent IFR flights, the pilots are always talking about how ATC did
this and ATC did that.