Indeed you can apply it. Out of EURUSD, USDCHF and USDJPY, which trade will outperform your opportunity cost ? 2 of them are in dominant trend in daily chart whereas one isn't. Can you pick those two ?
If you don’t take a hard look at risk, it will take you unknowingly. That I have learned throughout my years of Forex trades. If you don't respect risk, you'll be ruined by it.
I read such a story once. About a risky mistake. Someone wrote on Reddit that he was mistaken and set 1 lot instead of 0.1 and earned more money Funny, but so good! I consider such mistakes occasional and that man was lucky.. He could lose too. So, yeah, this was risky, cause he didn't close the order, but went on. He decided to risk and he won. Awesome!
Then I shouldn't be day trading as the risk is the greatest for me when I day trade, I don't have enough time to hedge for one minute timeframes, whereas risk on any trade an hour or more are all hedged and risked is great deal less for me. So many think day trading is the best, but by far costs the greatest and has most risk and smallest profits per risk.