Stable coins are good only for traders, but why you should hold stable coins instead of money? There is still risk that company that created stablecoin may end.
I am not a fan of stablecoins too, but they are useful for those who trust. Stablecoins are the best solution for daily traders and for those who want to avoid the loss of value caused by the bad market situation.
Also if you buy stablecoins, you can miss the opportunity of buying cheap cryptocurrencies.
But, if you know the right time to sell and buy, you will not miss a chance. Stablecoins are meant to take advantage of the decrease, in time of increase is not needed much.