Honestly I'd like to see new traders experienced all things that a trader must avoid because that will be their key foundation for much stronger and wiser decision in the future. Those errors, mistakes, too much emotion etc. that they will experienced on the way will be the things that they will now avoid or control in the future because they already used to it.
In such cases, that after a "long time trading" and that trader still not learned and experience continous losses then it might be the right time to change course as trading is suitable to them.
I couldnt agree more, in that way theyll be able to come up with strategies on their own a long the way. Getting more experience and the more new traders exposed to trading they can learn a lot and make them better traders over time. Mistakes are inevitable even those experienced traders still make mistakes from time to time and I think its normal whats important is they have learned from that mistake and make sure to do something not to make the same mistake twice.
Mistakes are nature of human being but best are those are learning from it and never repeating it, so better dont involve your emotions in trading it will give your pure trading profit, I can see my when I was new I use to get worry so fast and try to sell at price fall but now I have learnt to control my emotions and never trade at panic.