Stable coins are cryptocurrencies that try to offer the price stability with backed by reserved assets like USD, GOLD etc. In cryptocurrency, stable coins are created to solve many issues related to volatility and amplify to provide more utility. Stable coins are used as a method of parking money during the trade. It is also used as a base currency like USD. The first and foremost aim of using stable coins is to maintain stability that will help traders to retain their portfolio value against volatility. Traders, holders and users can know their portfolio value or transfer value with real assets like USD, EURO or Gold. In times of need or when traders or investors think this is time to stop their trade and keep their value before volatility, they can exchange their cryptocurrencies with stable coins. Job holders in cryptocurrency related firm can get their salary on the basis of stablecoins and remittance fighters can use it to send their remittance to their native countries within few minutes.
I guess the stablecoin already does its job to store the value or just like what you've to save method of parking money during the trades or to keep your money safe from volatility.
For me, it does really need a lot of different stable coins but I guess there are many for different platforms, for as a way of keeping your money safe from volatility you could convert it to stable coins since its kinda difficult to directly convert your cryptocurrency to something like online money or fiat money, so by using stable coin is it just like your balance but it fiat money since it doesn't really have a market movement like a cryptocurrency.
There's nothing really much about stablelcoin as long as it does its job, maybe there is fear since there is humor like stablecoin is not really back by some companies so it might get a market movement or something.