The NDBs are gone from the syllabus for the most part. You can still shoot them if you want but the NDB 35 at PNS is the only one I can think of. I only ever flew it once.
VFR I used to also use the PT portion of the CEW ILS 17 to LOC mins, using only the LOM. But LOMs are getting few and far between these days...
As to the failed card, I disagree. About 2 years ago, we had an IP and student on a cross country had to shoot a failed card ILS to 200 ft after water got in the gyro. Also they had radio troubles also because of water. As long as the helo only has one heading gyro, you need a familiarity with how to fly failed card.
Partial panel to mins is fun to practice but could get sporting in real life.
That gyro in that aircraft has at least a couple of failure modes. One is that it freezes, that's the easy one and the one that 99% of crews practice to. Another one is swaying back and forth about 30°, but that's easy to eliminate if you flip the switch to DG only (isolate the magnetic flux input).
A third failure mode that I saw in an old 60 is the compass card just spinning around and around. (That one was actually a maintenance induced failure, as the ATs had swapped the gyros as part of their troubleshooting, plugged something in wrong, and resulted in both failing.)
The instruments in the glass panel 60 have had a few interesting surprises the last ~15 years.
As long as the rest of your avionics don't get F'ed up by water intrusion then real world failed card (i.e. compass card does not give accurate heading information) needn't be overly difficult with GPS track. But...
you just never know.
The HT instrument syllabus should keep up with the times, but I'd like to see it stay as challenging as ever. Because...
you just never know.