Sizing defaults could do more harm than the rest of the app combined

This plus the daily limit in first-run setup would prevent most of the damage new automated traders do to themselves.

The "state what it means in terms of a full stop-out" suggestion is concrete and we can do that. Thank you.

YES! The dollar number is what makes it real! % of account means nothing to a beginner, seeing "this trade can lose $180" hits different!!

There's something worth noticing in that sentence too — the moment you read the loss in actual money is often the moment you find out whether the size was ever comfortable. Do people here revisit that number after a losing streak, or leave it set and look away?

Same, and I'd add it should show up again when someone changes size later, not just at setup. Half the bad sizing I've done was months in at 3am, not on day one.

Agree with the ask-don't-assume framing, with two caveats: 1. State the loss for one full stop-out AND for a run of them. A single stop feels survivable in isolation; four in a row is what actually ends people. My backtests always looked fine until I plotted the losing clusters. 2. Whatever number gets shown, base it on the actual stop distance the user set, not a generic assumption. A tidy example figure that doesn't match reality is worse than no figure. Also worth saying, sizing chosen from a backtest is the thing most likely to be overfit. The equity curve tells you what size would have been optimal for that exact past, which is a different question from what you can hold through.