gateway nodes aka bridges are centralized. crypto bridge proposes to change that and open ledger submitted a proposal for decentralizing their own gateways but so far there is no implementation for that. atomic swaps would help in a way but i didn't see any updates on that as well. newer decentralized excahnges with centralized orderbook have the advantage of complex order types, like stop limit orders, and fast execution that enables bots that bring liquidity. bitshares doesn't even support stop loss order yet.