Haha, the Italian. It has to be the most natural opening in Chess. When I first started studying chess seriously as a kid over the summer, I went back to school in the fall, and went 42-0 in Chess Club...by playing the Italian, mostly with 4.Ng5, then of course 5.Nxf7 and getting that rook. I'd ride that advantage to the win every time beating all those 600 and 700 level players, lol. I don't even remember how I learned it. They don't come more fundamental, or natural, than the Italian.
... If, instead of teaching a system, you teach beginners to focus on opening principles and pay attention to tactics, ...
Are there only two extreme possibilities?
"... besides the requirement to observe general principles, every opening presents its own particular, specific tasks, determined by the formation of pieces that characterizes it. ..." - The Soviet Chess Primer