I consider that having a DEX on Statemint/e would be also useful for supporting stable coins for Treasury V2. As proposed here it would be useful to have stable coins inside the treasury. Having a ‘trusted’ DEX that can be used to swap the treasury’s funds into some specific asset would allow a lot of flexibility. For example, proposers could specify the asset they would like to receive and the treasury could go ahead and swap the dot/ksm for the equivalent amount of the specified asset. So the treasury would have reserved practically all of the assets that the proposer would receive upon successfully completing all of the phases.
Of course, the specified asset would need to be listed on StateSwap.