The "one output" thing is basically reverse batching: Normally, an exchange will delay customer withdrawals for a few minutes and then send a bulk transaction with many outputs.
Instead, an exchange would delay deposits (which customers would send in the form of anonymous credentials) until the coinjoin round ends, and then accept a bulk transaction with many inputs.
Ark service providers can fill the UX gaps, allowing participants to "exit" from a different round than they "entered" from.
The "one output" thing is basically reverse batching: Normally, an exchange will delay customer withdrawals for a few minutes and then send a bulk transaction with many outputs.
Instead, an exchange would delay deposits (which customers would send in the form of anonymous credentials) until the coinjoin round ends, and then accept a bulk transaction with many inputs.
Ark service providers can fill the UX gaps, allowing participants to "exit" from a different round than they "entered" from.