I think at the moment is the absence of complete decentralization that is how Blockchain was invented for to be clear and decentralized but today lots of services and exchanges are regulated by the government which is not right and it can influence on the market as well because they can try to manipulate the price. Using exchanges like iDEX or EtherDelta try to solve this issue the same as an upcoming exchange DexAge using using p2p Escrow Trading will implement its features in decentralization as well thus government won't manipulate the exchange and the price.