So far, the function I feel the most about using stable coin is to save my assets from the usual dumps. Or, I might be looking to hold the coin steady for the immediate future. however, I find it very helpful with it. even more so if the assets we have are in the exchange.
In general, the main reason for use of stablecoins is to avoid paying too much fee. When the market goes down or when you trade, it will charge more to exchange crypto to fiat money. But if you use a stablecoin, you do not need a third exchange to keep your money stable in usd value. Stablecoins are on every exchange today, just convert whatever you want to it easily within the exchange and use it however you wish.