Have you checked to see how long it now takes to transfer on komodo? I assume transactions took that long in the past because it was being tested...
1) Nobody needs to sync with the DEX to use it, since all the chains is held by the masternodes running the DEX.
I guess the masternodes are rewarded for this?
Not a fan of the whole "Binance DEX", since it's not a DEX in the first place. All the transactions is verified by Binance themselves (they own all the nodes), which isn't decentralized at all.
This doesn't even qualify as decentralized exchange. Shouldn't have been called a DEX.
I bet the developers would say they took this route for the sake of speed and capacity.