Are you sure cash games don't teach you something about tournaments and vice versa?
I mean, cash games taught me to watch more closely and learn more about my opponents while playing. Conversely I suspect tournaments can help to do the same thing more quickly.
Maybe I should elaborate. What I mean is, I learned to watch more and learn from playing in cash games. I had played in lots of sngs and freerolls
and the like. Did reasonably well at it with the occasional final table here and there(never higher than 4th place I believe in freerolls, but lots of 1st and 2nds in sngs). But I wasn't really good(I'm still not really good but I'm learning). Someone told me that a rule of tournaments is to not play at first but "watch and learn stupid". But there was always too much adrenaline involved. It was just too exciting, and I really didn't know what to watch for or learn from.
Cash games have been teaching me what to watch for and learn from(microstakes but still). I noticed that in cash games position is important all the time. From the moment you sit, till the second you leave, you have to pay attention to position and the cards. I don't think it's as true in tournaments though. You can still play the cards positionally in a tournament, but the size of the bet's not the same. Maybe there are more beginners in tournaments(It makes sense because a lot of folks got all their winnings from freerolls so they're more comfortable in that setting). So I'm thinking that with more beginners you just have to bet way bigger all the time whatever your position. However, I noticed, once the field gets quite a bit smaller, you can start to bet more positionally. The important factor though, is I think I would still suck at playing from position if it weren't for cash games.
I wonder what Barry Greenstein would say about it. I mean, he's reputably one of the best cash game players in the world right? But he's also very successful at tournaments and has the final table experience and bracelets to prove it. Somehow I can't help but think cash games would have had to help him.