You're right, but from my point of view, besides investing in a coin, it's ok and try to trade at the same time.
I think its better to conduct both of them like you doing investing while doing trading so you can earn double income. Even it is difficult to manage you should try to do it well so it will really end up in a positive income. You need to put more effort and time in order to become successful in doing investing while doing trading.
sometimes, someone holds the altcoin they have until the price drops, because of that, many people say that don't trust any altcoin. Well, I think this is just a matter of strategy, and how you use the altcoin you have.