Forza Horizon 3....a racing game where all you do is go from point A to point B...is more complex than Zelda. I HAVE HEARD IT ALL.
Again FROM A TECHNICAL STANDPOINT. Seems like y'all keep purposely ignoring that context.
Simulated skies. Hundreds of cars each with their own physics. Multiple diving surfaces that all affect the tires differently. Different tire materials that interact with the different surfaces differently. Rain that falls, accumulates and dries, and also effects the tires grip at different levels. Aerodynamics of the cars taken in account. Drag, downforce, tire wear, damage, and the list goes on.
And all this is calculated in real time for hundreds of cars.
That's very complex FROM A TECHNICAL STANDPOINT. The actual gameplay may be simple if you don't think about all this, but there is a lot going on.