I just went through my two tandems and first AFF very recently, and I have to say I very much appreciate what my tandem instructor did for me. Beyond canopy flight stuff, the three S's etc, he even made a point to teach me about airplane exit procedures and pilot communication. He taught me how to turn and track (although I know this is impossible with a drogue, it was still fun to try and get the body position down). It left me more prepared and confident for AFF and I actually learned more on how to skydive, rather than just feeling like an ATM to the DZ, where I probably would've made the decision to go elsewhere.