A crypto pegged 1:1 to the USD?
That’s the point. ADA-CASH would be semi-centralized (some replicator supernodes come to mind) and Cardano would be the gatekeeper (coordinator). Remember we are trying to introduce a non-volatile coin pegged to the USD to handle million of transactions in world commerce and need to propose different approaches. Cardano will keep ADA as store of value and Daedalus will easily handle both accounts.
Keep your savings in ADA and your daily expenses in ADA-CASH.