The confound
An unconditional hit rate falls when entries get worse and when management gets worse, identically.
Suppose the share of trades reaching 2R drops by a third over a month. Two stories fit equally well. Entries may have deteriorated, so fewer trades ever got moving and the ones that did behaved normally. Or entries may be unchanged and continuation may have collapsed, so the same number of trades got going and far fewer carried through. The unconditional rate cannot distinguish these, and they call for opposite responses: the first is repaired at the entry, the second at the exit or by changing which regimes are traded. Conditioning is what makes the two visible as separate lines, and once separated the diagnosis is usually immediate.
Schematic. Both months finish with the same share of trades at 2R. The shapes say different things — one lost trades early, one lost them in continuation, and the repair is not the same.

