This is good analysis and points to why succeeding at trading is harder to learn and achieve than all other jobs. Its not that its hard, its that it is so different.
In all other areas of work, as you say, we’re told to work harder and know more. what this leads to is a focus on the mistakes. This starts from school or even home life - focus on the mistakes you made and eliminate them and you will be successful.
So we spend most of our effort on eliminating errors, which only made up 20% of our work in the first place. If you work really hard at improving your performance on the 20% of errors and reduce this by a tenth, you’ll be down to an 18% error rate: which means an 82% win rate. But if you put the same amount of effort into improving your performance on the work you did which was error-free, and you improve your outcomes here by a tenth, now your win rate is up to 88%. Its obvious where the effort should be going in trading.
But its worse than that. so many new traders come here with a trade that made a loss and they’re thinking they made a mistake, and that caused the loss. Sometimes they actually didn’t. Its just that even if you’re the best trader in the world, the market sometimes will go the way that was least probable.