That's where you and I differ in opinion. I believe, for a private pilot, that is the only thing that should be necessary.
What kills me is reading ground school material, and seeing that every single one of the texts include verbiage to the extent of "To roll the plane to the left, the pilot must turn the yoke to the left." Really???? That needs to be taught? About the only control input that is not obvious to a new pilot is that to steer on the ground, one uses their feet, not their hands.
Speaking of - why do we care about having to be coordinated at all times again? If I'm flying uncoordinated, even through a turn that is not near stall speed, why do I care? Oh yeah, because its "Good practice and shows mastery of the aircraft."
When you learn to drive, do we spend an hour teaching the student driver how to make the car turn? ("If you see a turn coming, turn the wheel in the direction of the turn, not against it."). Do we require that they understand the DOT regulations inside and out? Do we teach them what they CAN'T do? I don't remember being told during driver's education that I was not allowed to carry certain materials onboard my vehicle, even though those laws exist.
Why? Because we haven't dumbed down the process to the point where we have to teach each minutiae to the student. We make assumptions that there are obvious points that they'll either know or figure out on their own.
So - what is the difference between flying and driving anyway?
1. You have to use a radio in some instances
2. You have an additional plane of controllable travel (actually, I suppose you have 2 additional)
3. Getting lost is slightly easier (hence the need for navigational training)
4. Running out of gas is a bigger deal (can't teach that one)
5. There's no "road signs" (but, we have a nifty little book that gives us the rules that exist, and for the most part, the rules are consistent nationwide...no speed limits that would apply to a private pilot anyway)
6. On the ground, you steer with your feet
7. Accidents with other aircraft are usually fatal
8. Landing is not natural (This is probably where the focus of teaching should lie)
But honestly, if you took a new student, handed them the controls, and said, without any other training, "Fly us from here to the next city. I'll show you how to taxi. I'll perform the landing," do you really think a student is going to not be able to figure it out?
edit: Oh wait....how will they ever figure out how to turn left