~Snipped
Why are they called “stable” when they are actually unstable?
They're stable most of the time like 98%of the time but not 100%.
For example, if you had $10,000 in 2020, nominally you still have $10,000 today, but its purchasing power is only about $6,800.Maybe they are considered “stable” only in terms of losing less purchasing power
Well, that's how they are designed to be. Imo, these stablecoins were originally created so we can have a universal currency that we can pair Bitcoin and other tokens in the early days. So if we want to say bitcoin is worth x amount of dollars, we can do so easily since it's impossible to get standard fiat onchain.
As for the value, it depends on the inflation in your country but as long as you hold your stablecoins and it doesn't depeg, you still end up with your tokens with corresponding dollar value. In my country, holding stablecoins vs national currency was actually the best play in recent times.