Trading is hard and by trying to master different types of trading, traders will have to spend more time, more money for experiencing these types of trading. As said, because of difficulty in trading, by experiencing more, they will possibly get more losses, pay more costs for their learning, not only for learning courses but for actual trading practice.
Yeah trading is quite time consuming I feel like I wanted to do investing or doing dca more than to monitor my chart 24/7 just to make some gains. Doing a relief trade that produces gains and profits after 1 week 1month or few months will still be considered gains. So it depends on one strat on how he can earn from trading. The one I hate is the day trade approach.