I disagree, just because you werent able to get mechanical systems to really perform, doesnt mean other people havent, like myself.
Your statement "Systems writing = testing = trading taught me many realities about markets and trading I'd never have learned otherwise. "
is very true, but where you chose to move away from mechanical systems, and only use them to "learn about the nature of the markets", I chose to to make them better, and created systems that can actually trade the markets better than "a slow human". There is no way in hell I could be fast enough to grab some of the mispriced shares available out there, but my computer can in milliseconds.
My systems run in the 64% win, profit factor 2.4 range these days, with very tiny drawdowns. Soon my accounts will exceed the liquidity the systems target and my returns will slow down.
Im not one stage away from the final evolution, I blew it away

I sit back and let the computers collect money each day, I dont have to watch the markets and my time is free'd up for improving the systems and building new ones.
You said:
"their way thru the natural learning curve. "
Yes they are, but they are at the very very very beginning, and SOME are already boasting about what a killing they are making. I know for a fact these silly system ideas they are toying with are not where the money is at. SOME of these guys are just pretending they are "Traders" or are seriously fooling themselves. They have no idea how far they still are from real successful trading, and its obvious to the "real" traders, but not to them.
Look at the recent post of "tightening stops" to stop those bad trades sooner. An experienced trader already knows this is going to make their performance far worse by getting their winners stopped out more frequently
Oh well, ill let them keep pretending they know what they are doing. Trader28 or whatever the idiots name is, keeps talking smack like he's a god of trading yet makes it obvious with every post he is still in trading 101 class. Oh well, I tried. Too much pride in the way from some of these guys to learn.
Quote from austinp:
<i>"But ive backtested the hell out of thousands of combinations of the kind of indicators you are using and I know they are worthless."</i>
As a retired systems writer, I can tell you these indicators are 100% worthless for mechanical system success. However, they do indicate price strength = weakness at any moment in time. A body in motion tends to stay in motion... which is precisely why "lagging" indicators do predict future price action with a favorable odds of outcome.
Combine the use of these simple chart tools with an understanding of price patterns = behavior, and discretionary trading can be successful. Actually, the simpler the better.
<b>Dragon</b>, you are still one stage away from the final evolution as a trader.
Systems writing = testing = trading taught me many realities about markets and trading I'd never have learned otherwise. That invaluable education coupled with extensive chart research taught me how to trade circles around the most robust <i>mechanical system</i> any man or computer can create = conjure up. There are no exceptions to that statement.
The people in this thread are working their way thru the natural learning curve. I'm not part of their group, but do appreciate the massive efforts involved.