True. Trading is not something that will guarantee consistency in profits, but definitely it has its own inevitable losses as well, even if you are a legend in trading. I supposed one already knows about this prior to trading, otherwise he will definitely find it difficult to accept those losses he encounter while trading.
This only proves that if you are in the state of losing, quitting is never the option but a motivation to improve more your trading abilities and skills. No one gets shortcuts to successful trading, one should always know how to win those small battles of losing first so he will be more ready to face the big challenges in trading.
To make consistent profits from trading is certainly not an easy thing and I have also seen someone like the one you are telling me about and in my opinion they have been very good at trading but they have also experienced failure in the trading they do, but they never thought about leaving. trading because they already know well what they have to do and if they want to return to trading they will of course be more careful and will not repeat the mistakes they have made and you are right it is not possible for someone to learn trading easily of course they have to go through various processes to become a successful trader.