Ah, OK, Google "Tamas Gelashvili", or find him at Wikipedia, or finally any chess database.
He is rated around 2600, and he is still playing those funny "look-like-openings" with both colors that he played twenty years ago. His secret is simple: excellent positional understanding, exquisite fighting spirit.
You are 1700, and know better. He is almost one thousand points higher rated than you, yet he does not seem to know much, if anything...
Somehow I knew someone, probably you, would single out "I am 1700 and I know better" out of context.
I am 1700 and I know better about what it is like to play other people my level right now than you do. When is the last time you played against 1700's in a tournament? Do you sandbag to go beat up on us patzers?
I do not know your 2600 player. But you mentioned he has been playing those openings for 20 years. Likely, he knows his "funny little openings" quite a bit better than I know my mainline stuff, right?
I am simply telling you how people at class level are playing right now, expecially the young kids. They know their openings. There are two ways this helps them in their ratings - first, by knowing them so well, they get into better middlegames. Second, you learn something about chess as you study openings.
You can deny it again if you like, but its a fact thats what people are doing today. Go watch a tournament with elementary school aged 1700's and 1800's and they are playing openings pretty deeply.
As another point, you mention the 2600 has "excellent positional understanding", and this presumably lets him play offbeat stuff. Well, I suppose I have to point out the obvious here - my positional understanding is nowhere near that player. Deliberately making an early offbeat move is just counting on my opponent not seeing whats wrong with it. Why should I try to play chess like that?
I agree with pfren, I think until you become very advanced there's no need to clutter your mind with thoughts that will just confuse your anyway.
I like to keep it simple and stick with the basics: I play something familiar, develop pieces to useful squares, get the king to safety, and try to play good solid moves each time to gain an advantage.
An anology would be golf, if you are a beginner or average player, trying to study the golf swing of Tiger Woods and do exactly what he is doing is a mistake. Just learn the basics first, build from there.