I agree. The danger is young players learning opening theory often use it in place of middle-game/endgame knowledge as if it compensates. A good opening is no doubt, a critical factor to any game nonetheless.
Have to say as of recently we had a talk about the Daeth Opening. And it was said by an NM that a good player can almost win with any opening due to playing skills.
I have to say if you get a chance to apply your opening theory it will lead you to a good middle game. And i found once i there i put it to my opponent and never let up. Only time i have a problem with this in when me and my opponent are both playing sound opening theory. And the middle game starts off even on both sides.
I have to say i give all the credit to my quick wins to opening theory. Over 50% my opponent resigns is when i caught them violating opening theory.
18 moves ouch, is that what they call a quite open? From the last two responses then my hope with chess then is that thier is an "Art" to going Off Book.. I do want to pick up a database and some current move by move type talk about some particular openings. I like what you said royalbishop on piece cooridiation of tasking. Recoginizing when your pieces have better value. I read somewhere a couch would have his students count each square his pieces could effect. I sorta try and do that sort of thing to evaluate my pieces positions..