I think it's possible they have both short-term predictive power, and for it not to be profitable to trade the signals they generate. For example, something lik

I think it's possible they have both short-term predictive power, and for it not to be profitable to trade the signals they generate. For example, something like "price below the 15-second EMA" might mean in the short-term there is large probability of the price falling, and in the small possibility it reverse, it spikes a lot higher, making it not profitable to take a directional bet on the price. This can make those signals good for investors to decide whether to invest in a rising bull market with low yield and a tail risk of large negative return or a falling bear market with high yield and a tail risk of large positive return. There may be no objective profit, while allowing "subjective" profit in utility by matching investor's risk profile. It does sound like gd1 has more experience than I do, though, so don't trade off my perspective.