Without the order book, how in the world are you supposed to know where the big buy and sell walls are and at what depth your limit order is placed? The order book is invaluable for traders.
Buy and sell walls can appear and disappear any second and spoil any strategy based on them. In fact I'm pretty sure it's the big whales who set them just to manipulate the market.
Do forex traders use order books?
There is next generation exchange available for on this platform than why still people are looking for other exchanges.