https://gov.curve.fi/t/adding-a-2pool-base-implementation-of-usdc-usdt/3000 (I'll let that proposal speak for itself)
tl;dr establish a USDT/USDC 2pool as they are the prominent centralized stables, and establish the 4pool (UST, FRAX, USDC, USDT) by popular demand.
what are your thoughts, ohmies?