Discretionary trading makes decisions in real time using judgment and feel. Mechanical (systematic) trading follows predefined rules — if these conditions, then this action. They're the two ends of a spectrum, and the trade-off between them is real.

The case for discretion

Human judgment adapts. A discretionary trader can read a surprise headline, sense a regime change, or feel that "something's off" in a way a fixed rule can't (AI vs human traders). At its best, discretion is flexible and context-aware.

The case for rules

But discretion's flexibility is also its flaw: it's the door through which emotion enters. The same trader who "adapts" also revenge-trades, chases, moves stops out of hope, and sizes up on a feeling (FOMO and revenge trading). Mechanical rules are rigid, but rigidity is the point — they execute the plan identically whether you're calm, tired, or tilted (emotional discipline).

Discretion lets you adapt — and lets you self-destruct. Rules can't adapt — and can't panic. For most traders, the second trade-off is the better one.

Why most edges favor rules

Since most retail losses come from emotional errors, not bad analysis, removing the human from execution tends to help more than the lost flexibility hurts (why most day traders lose). The common structure: a human sets the strategy and boundaries (the good discretion), and a mechanical system executes them without deviation (the discipline). That's precisely NoVo's design — you decide the rules, it runs them non-discretionarily (setting your boundaries).