The anchor
Distances are quoted in volatility, not pips.
An ATR-anchored stop is a contract with current conditions: the same 1.2× coefficient produces a wide stop in a violent week and a tight one in a quiet week, keeping the probability of a noise stop-out roughly constant. Fixed-pip distances do the opposite — they are simultaneously too tight for expansion and too loose for compression, and the trader experiences that inconsistency as random bad luck. A stop quoted in pips is a stop that means something different every week without anyone changing it.

