Actually, one of the best things that happened to crypto are the stable coins indeed. Its the fastest way to lock your gains in this domain, you can't actually gain in crypto (if you're a trader) based on selling your crypto to fiat directly, it simple won't work, because it take time, during that time lots of shit can happen.
Stable coins are great for those who knows when to get out & get in again during discount prices.
I agree, one of the best things created in crypto is stable coins. We all know that almost all of crypto tokens/coins have very high liquidity and for us to take away the liquidity is by buying stablecoins that are stables unlike bitcoin ethereum. But the problem is most stablecoins keep on minting their own token/coin that can fluctuate the total supply. I think this will be problem in the future that stablecoins will not be stable anymore.