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To me, it feels somewhat like MMA. One cannot be an expert in only one fighting skill and expect to win. One has to know boxing, kickboxing, jiu-jitsu, judo, wrestling etc. Similarly, one technique will only work sometimes but not always. I had an INCREDIBLE SCREEN that was 20 deep that had a CAGR of over 30 from 1987 to 2006- 19 years. I included friction and did not use low liquidity stocks. Then from 2007-2018, the CAGR was less than 5%, and behind the index. Needless to say, I was a failure. (I define failure as failing to beat SPY).

From that experience, I'm more willing to use screens from anywhere. They're important because they bring different "fighting" skills to the table. One such screen is IBD's ETF Leader's Index. For over a year, I used to buy all 20-30 ETFs as part of my MI. Recently, IBD has come out with an ETF (LDRS) that keeps track of those ETFs, so I just buy that instead. It's about 10% of my MI.

I see your point, but one exception might be the lazy portfolios. That seems to be pretty much all you need to do reasonably well.

Since most people buy at the top, and sell at the bottom, even achieving 90% of the s & P's
gains, probably puts you at the top 20% of investors. In that sense you are a great success.
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