[pc86]

You still need critical instruments such as airspeed, RPM, manifold pressure, etc. Especially on crystal clear VFR days, it's possible-bordering-on-easy to fly the plane with your head stuck in the instrument panel and being mostly aware of the horizon in your peripheral if, for example, the instructor obscures the attitude indicator.

You can't even "feel" the plane in FAA-certified simulators, so I'm not sure how you'd feel it on a laptop with a joystick and plastic rudders. And of course the big issue - if you're VFR you need to be looking for traffic because nobody is handling separation for you except you.