To me that is not correct Trading is all about your proficiency and apprehending and how you control your frights and tolerance, and I think your tough labor amounts to something a lot too.
maybe someone is lucky in the trade made. but that won't happen consistently. but those who have skills and experience in trading can consistently make profits.
what you say is quite correct. but perhaps you can separate the distinction for those who invest and trade. both are something different. Some investors are not skilled at trading. and there is also the opposite, although there are also those who are masters of both.