With Mackey on this, I also came from the school of hard knocks. It is fairly easy to figure out how to use a FMC, BUT.... try flying an ILS to minima single engine RAW DATA and see how far you MPL guys get, or how about a NDB, again Raw Data??? Flying the good old twins gets you used to anything.
Now before you tell me you never do that, we I did last night for my OPC and passed. Still at least with the MPL you will know how to put a hold in!