Stop loss is the main element in the risk management strategy. Of course, if you are constantly in front of a trading terminal, you can manually close your order if the price moves in the opposite direction to your expectations. But with a dump, it is not always possible to react to price changes in time, and as a result, your deposit may be liquidated.
I think not really the main but it is only a feature or an option. As said, we can also stop losing in a manual way. Also stop loss is a feature in trading but before we get there, we can already apply a risk management by setting sufficient amount only for trading. Anyways, yeah that stop is not built for greedy traders but rather it is for the responsible traders.
After years in the markets, I’ve come to realize one simple truth: a great trader doesn’t trade with their own capital
Oh! really? But I think you mean because they are so great and that they already accumulated a lot of profits already and then it was now their profits is the one that they are using to trade. But I think this is still considered as a capital

. Even the bonus given to us freely by the platform is considered as capital too.
@OP , the answer to your question is pretty simple, and that is obviously, if we are not losing too much anymore

.