Yes, i also think so that both trading and investing need more knowledge to be successful. I personally saw many investors that invested without knowing vast and fall in deep problem and same as traders. Market is not much volatile to everybody must have to be careful so that they can not feel upset in future.
I think the more correct way of telling this is that trading and investing is a part and parcel of the same thing. This is different from the stock market though. Here you will mostly be investing in altcoins, although they are other methods to invest too which are sadly much less in number few of which being casino bankroll investments. Here one will also trade those invested coins. So it is one after the other and not two separate things.
Of course market volatility is the reason why people trade. There are no reasons to trade a stagnant coin which shows no signs of life. We all know what to buy in and not what not to.