[Aaron Smith]

I agree with the other posters. I have been a dedicated fingerstyle player for 10 years, and I'm still learning new right hand techniques all the time. Different musical styles demand different approaches- sometimes I use thumbpicks and fingerpicks, sometimes not. Sometimes I use 1, 2, 3, or 4 fingers depending upon the style that I'm emulating. I've worked hard at developing free strokes, rest strokes, arpeggios, rasgueado, false harmonics, etc.
The good news is that you can play some pretty cool things without a lot of advanced technique. If your only goal is to get through "Freight Train" cleanly, then you won't need a lot of this stuff. However, one of the best parts about fingerstyle guitar is the number of different tones and techniques at your disposal to express music.