Very much so. However, very rarely is the scientific method applied to indicators. Rather novices rush toward them as if they were magical. Candle patterns, for example.Well I respect your point of view and your point about tides is completely valid.
For me evaluating something within a scientific framework gives a good base. Using this for questions that don't have a proof surely is useful?
Someday someone may come up with an indicator that has value, even if they do lag. In the meantime, I'll stick with trading greed and fear.