Partial panel NDB Single engine with a gear failure was expected of me as a student. Anyone who can't fly one in instrument training shouldn't be signed off (I'd never want to send a pilot with my recomendation to fly around IFR in a piston twin if they can't handle this).
During my flight training, the instructors put every student through this one: You're partial panel, fixed card (gotta' go fixed card!) at a high alt. field in the winter, so you got the heat on and the boots going (if you have boots). You'd turn inbound and lose the outside engine as you turned inbound and lose the alternator on the opposite engine. Most every student was so preoccupied with the dead engine they completely missed the alternator failure and the low battery. Not a big deal, until you go put the gear down at the FAF. Uh oh, gear's 1/2 way down (electric gear, ran outta' juice), and you're low and slow, single engine at high altitude, so you have to eeek out a 250 FPM climb to go missed (gear is still out unitl you crank it back up, which is quite difficult when single engine partial panel).
This situation teaches the student to be aware of the entire airplane. If you load shed, you can get the gear to come down at FAF and likely land safely. But if you don't monitor electrical, you meet your maker on the missed unless you have perfect Vyse and get cranking ASAP; your failure to monitor the airplane put you in the situation, not the instructor pulling breakers. A great teaching tool, sure to humble just about any student, and to teach them that just when it can't get worse, it does. You must monitor the whole aircraft at all times.
Any instructor who sends their students out into the world without preparing them for the worst possible scenario should feel all the guilt in the world when that student comes back in a body bag b/c you coddled him, giving him only 'realistic scenarios'.
The instructor student relationship shouldn't be abused by the instructor, but if you allow a student to dictate what is realistic training, you have failed as an instructor. You are the higher rated pilot, the more skilled pilot, and usually the more experienced pilot for a reason. Airliners have gone down b/c MX covered static ports and the flight crew was unable to decipher a static port failure! Reality is, anything can happen, and if you can handle the worst, you will likely stay calm when something minor happens.
Reality? I am reality! -Sgt. Barnes, Platoon
-Boo!