Also, by using stablecoins it brings to the community a better solution for fiat. It is permisionless, borderless and can be cheap to use. But I agree to the cons also after what happened to Luna and UST.
This makes no sense after your previous statement. First, you like the idea of replacing fiat with crypto, but then you also like crypto that is 'stable' which means 'pegged to fiat'? If we want to get away from fiat, we can't promote 'digital fiat'..
Unless a stablecoin exists that is pegged to 'purchasing power', which I don't think exists as an established index or anything like that.
Not only does the value of stable coins depend on a single company, that also gives them the power to "taint" any coin they want. They could just as well have used a central database instead of a blockchain.
It gets even worse when a certain scam exchange creates their own centrally controlled blockchain and adds a stable coin (and even Bitcoin!) on their own fully controlled blockchain. Now there are 2 companies that can taint your coins!
TL;DR: "not your keys, not your coins".