Rayvt; “Trying to a consensus of several systems is futile. It has the same problem of deciding which of dozens or hundreds of systems to use. It's the same problem, just one step deeper.”

I’m going to respectively disagree with you on this one. If you carefully choose three or more different systems that are each based on different fundamental characteristics and have had positive non correlated results then you are much more likely to have a future outperformance. The 200 day you mention is one of the oldest discoveries that has held up post discovery. GTT by Philosophical economics which you like also appears to have a good fundamental basis. Another one based on value vs price Risk Premium Value is another example. Turns out that all three outperform during different market conditions. Putting them together in a backtest doesn’t increase the return so much as it tends to smooth the ride.

Been doing this for several years now and so far, it seems to be working. I absolutely agree with your observation “We don’t need to be perfect; we only need to be Good Enough.”