I think Forex is not the only trade that needs to be studied with care or that is complicated, cryptocurrency, stocks and other tradable items are complicated and needs attention very well because they are both really volatile.
Each and every speculative asset is volatile and is worth investing because each has their own pros and cons while delivering returns - otherwise nobody would trade on that asset at all. It does not mean that all millennials will move to bitcoin, unlike some news media might be saying.
As mentioned every speculative asset have got its own market. Some used to be highly volatile, whereas some doesn't vary big. The returns and the percentage of risk used to vary between the different assets.
The point is that there need to be a diversification assets that you earn into investment tools that you know and prefer. Being stubborn and going all-in into one asset is a wrong move. Today your country might accept bitcoin but tomorrow there might come in adverse laws against it, then the same news media will change its tone and say that millennials want stocks. Funny how these change in tone comes faster than the chameleons color change.
Diversification is a must with all forms of investment to keep the portfolio strong against the varying market. Going all in one is good, when you've got the expertise knowledge to take the profit and come out of the market.
Hence if someone has expertise in one asset, continue with that only, shifting assets is a risky move - worth it if you can do it at the proper time and with proper backup plans.
Being an expertise in one form of investment and an immediate swap is not good, because different form of investment have got different markets. Learning it and getting into the market parallel to the primary investment is always a good choice.
Each asset has its good and bad days - I agree. Hence it is better to keep a diverse portfolio but avoid altcoins - your crypto should mean coins from the top5 coins only.
When we go with the cryptocurrency investment, adding top cryptocurrencies on the market will lower the risk. Also makes the portfolio strong for long term, whereas if you're into the market for short term profiting then you need to focus and learn about the trend at the moment.