This thread was directed at traders, not investors. Traders tend to use more leverage than investors.
Overnight leverage for 'buy and hold' is the same overnight leverage as 'buy on close and sell on open'. All of the traders I know expect their trading strategy to beat buy and hold.
I'm curious, are you saying as a trader you are not going to research buying at 1 or 2 std dev below the day's close and exiting on NY open or buying at European open and exiting on NY open? As a trader would you just accept the article's conclusion as the best trading strategy out there and expect it to magically continue with the same results for the next 25 years?
What were the results of the strategy October through December 2018? Just curious if a 'trader' would suffer through 3 months of bleed.