You could learn with a hobbyist too, just probably not the advanced stuff or not quite right ... for the most part though hobbyists (including myself) end up teaching you how to do a flat turn, and that's no good
And, Bluesman, you're not -entirely- correct. The principles can be taught in a sim. The physical component is not learnable without access to a real aircraft (trackIR is a poor substitute for really moving your head), you're certainly right about that. In addition in a lot of sims now you won't really be able to tell the other guy's throttle settings or energy state from say a speedbar or such - you have to judge by his maneuver.
While you are correct in -principle- that some things you -definitely- cannot learn in a sim, I think you are a little off on the details. Just my opinion as a 'hobbyist' with an RL F-15C pilot for an instructor :D
If you'd like some deeper discussion for my opinion (where I can obviously only discuss my own experiences) I wouldn't mind going into it.