Isn't the purpose of bitcoin is to eliminate trust in the equation in making transactions and trades? Wasn't it written in Satoshi's paper?
Of course, but it doesn't exist in a vacuum and maybe never will. There'll always be the need to interact with fiat.
Bitsquare's great for what it is but I'll guess that very few people use exchanges for the straightforward buying and selling of Bitcoin. They're there to play market and I don't think there's a way of realistically decentralising that yet.