They may or may not be a waste of time, but they are not science. Without the hypothesis of a mechanism, and experiments specifically designed to disprove that

They may or may not be a waste of time, but they are not science. Without the hypothesis of a mechanism, and experiments specifically designed to disprove that hypothesis, it’s not science. Post-hoc observations of correlations are more closely aligned with astrology or financial journalism than anything we should consider science.