When it comes to security of exchange or security in general, there's always something more to do. This explains why despite the fact that binance had a good security system, hackers were still able to part away with 7,000 btc. To be on the safe side, it's necessary to continously update the security outfit.
Yes, Bcnex needs to consistently upgrade their system to ward off intruders from the exchange. The issue of hackers are quite disappointing and that's one of the challenges we face in the cryptocurrency industry. I believe a standard should be enacted to tackle this issue and give credibility to our trading platforms.