Since you're talking into online money, there will be a way for being hacked.
All we can do is just keep the things updated and changed password regularly !
Remember, even the most secured exchange able being hack so they will be no problem to hack your wallet in the future
You right. It is better we moves the coins into another wallet so we don't have to be afraid from being hacked. Maybe we don't have to keep a big amount of coins in the exchange and we only use some coins to daily trade and we still have the other balance in other wallet. I still keep my coins in many wallet and don't depends on the exchange because I know that the exchange can get hacked in anytime. And I don't want to lose my coins because of the hacker.