It's actually a survival situation for cryptocurrency. When you have an account on a centralized exchange, with a balance... Over night they change the rules, and force you to obey or your funds get locked... That is a problem. It hasn't happened once. It's happened several times.
So when you say:
DEcentralized exchanges are where its at
It is true. But some people insist on losing their money, coins and funds first, before they look for the better way. I'm sorry they have to see it first, but some people insist on it.
Yes, it happened to me on Bittrex just the other day. I wake up one day and they decided to announce the delisting of Trig, then they locked the wallet for withdraws. Grrr just change the rules whenever they want.