Thank you for the detailed explanation of Atomic Swaps.
It is an exciting mechanism to be implemented into the blockchain. I agree that we need DEX in a bad way.
One thing you omitted when posting about centralized exchanges: they are subject to the regulations where they are located and operate. Failure to comply can result in fines or even shut down. Hence, even thought the blockchain and currency isnt under government control, the exchanges can be.
DEX fixes this too.
You're right! These days, exchanges like Bittrex and Bitfinex are throwing lots of users out and are even shutting down service due to laws and regulations.