Stable coins are not decentralized rather centralized, for instance, USDT, BUSD are all centralized ones. So going for stable coins clearly means that you are not centralized as you are claiming from very start. There are many standards which you have to meet to become fully decentralized.
Anything in DAO code is decentralized as it exists on blockchain and functions by itself. Minting anything is not a decentralized process as it has exterior actions to take. Example: Receiving and checking custody of funds in a bank. We are working on a blockchain-based custodian where stablecoins will be issued from staking crypto assets, a fully decentralized process. However, it is due next month.