Lately, this has been helping me in many facets of life, high accuracy, very sophisticated algorithm
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Personally, I tried OPs method in the 90's, and found I was minimizing my returns.
A friend's friend did that in March 2020--he likely cost his family a lot (He made a similar claim so I recorded the S&P 500 that day).
The way to look at it imho is a very wealthy person, or a mutual fund manager can't possibly move all out and all in, and they don't. So why should the rest of us do that. We may not get the information that they do, but why should we make matters worse by not using fundamentals? Very hard thing for me to explain to my mom (I took her advice and sold amazon in 2001 because it had tripled).