Is it? I mean, you press the thing and go and turn with that thing and stop with that thing. About as hard as learning a handful of mechanics, right?
I think we've gotten to the point where the argument includes different unspoken things as success states. For RPGs, in this thread, it seems to be very low at 'can you use this mechanics, great!' For cars, though, is seems to be 'can you drive this car without causing accidents and according to all the detailed laws of driving, evidence of duly witnessed and approved by government official.'
Now, granted, the failure state for a new RPG mechanic is pretty light compared to a motor vehicle's possible range of failures to drive. That's valid. But let's take care that we don't reduce RPGs to trivial interactions with a dice mechanic and use that to prove that RPGs are easy to learn. Like driving, there's a bit more to it than that. I mean, I learned to drive a car around an empty parking lot in about 15 minutes. That seems to be the comparison to learning a new RPG being made, yeah?