The main lesson from the previous crash is that the holding is a bad idea. Volatility of the crypto currencies is very high, therefore the trading is very useful, I think.
While Bitcoin falling I noticed that people who have already sold their crypto currency on the high levels try to dump the markets more deep, posting a bad or even fake news.
Trading is useful. You said that because you have the profit from trading. For me both are still useful since we still have profit betwen both type of investment. Think and do wisely then both system will carry us big profit. However i will never judge this because we have our own preference