Hi, I'm a normie who finally got into crypto in nov 2021. But I don't get stable coins. When you sell your crypto, why don't you just convert back to fiat and put that fiat into your bank account right away? I worry about stable coins becoming un-pegged; this is a big concern for me; it's an extra worry that you don't have if you just convert back to fiat right away.

I can see using stable coins as a trading pair to purchase alts on a dex but I don't understand holding stable coins for longer periods of time like weeks, months or years as a store of value; to me this feels way too risky. What am I missing?