I don't believe, "You Learn More from Losses than from Wins" because that's incorrect. One can learn both ways. In fact, I learnt more from my wins than I did from losses. You talked about losses like anyone wants to have them and then readjust from such. If there's anything losses will even do to beginners, it's to scare and discourage while introducing them to reality.
That instinct is not ideal, but many of them taught that the only form someone can learn how to make profit it's through the methods of losing and make correction. That conception is encouraging especially for someone who's a beginner. It have build the mindset that it most have venture into lost before getting profit in trading. The main objective every trader or investors should have as agenda or plan towards trading is the ability to identify an error when it has not occur, and these can be achieved through devoting time to learn the basic strategies of trading.