Curve V2 allows for non-pegged assets to be paired. This would mean not needing to pair stablecoins on Curve or pegged assets like ETH and sETH but doing so in pools with different price ranges. This gave birth to the Tri-Crypto Pool, which holds, BTC, ETH and USDT.
Unlike stablecoin pegging, none of the three is meant to be pegged to the same value but Curve supports the peg around those different assets and concentrates liquidity around the price.
The genesis of Curve v2 was meant to be an algorithm to exchange volatile assets. While this is different from its main purpose of swapping stable assets eg. stablecoins of USDT to USDC etc, it now enables the swapping of stable assets of USDT and USDC to volatile ones like Bitcoin and Ethereum.