Recently I came across an article about the future of decentralized exchanges and how they are going to transform the centralized exchanges. One thing that clearly mentioned is that decentralized exchanges are secure and impossible (kind of) to hack as no central entity is running/controlling them. However, I heard about the security breach of Bancor and waves DEX. So what's the point of decentralized exchanges if they are still being hacked 
An exchange that is truly decentralized is never holding your coins which means that if you lose them the exchange was not hacked but the user, this puts the responsibility of protecting your coins once again in your shoulders which as we know is a good thing and also a bad thing, it is a good thing for all of those that are looking to have complete control over their money, but it is also a bad news for many people that are simply not prepared for taking that kind of responsibility as we see all the time in the forum when people expose the circumstances in which they lost their coins to hackers. There are many more reasons of why people are excited about decentralized exchanges, one of them is that with decentralized exchanges you will not need to go through know your customer policies.