Actually, "non-trivial" is in the eye of the beholder. Or more exactly, tasks that seem hard to one very often are quite simple to another. And there are lots of "non-essential features" in every one of the sims. And nice to have features are often the ones advertised as offering "something more" in the sim.

Back in the 60s, when the major airlines were computerizing their operations, one big ticket item was flight planning. A number of the airlines developed their own systems. All the systems wound up to be heavy loads on their existing installations. One carrier even bought a couple more mainframes to run their flightplanning. The group I was in was given the task of re-writing our recently "perfected" system as it was being migrated from one type computer to another. One of our guys looked at the logic and said, "why in blazes are we doing it this way? we ought to do it with......." and we did. And the new way of computing a lot of the values that were melting down those super CPs (central processors) made the new rewrite use so very many fewer cpu cycles that it scared the crap out of upper management. They were convinced that we had to be leaving out something, that our logic was skipping important computations. It wasn't. Matter of fact, our new way was also more logical AND accurate for the problems being solved.

Some seemingly difficult things aren't.