Stablecoins enable cash-like (instantly redeemable and verifiable) payments for large amounts, for almost free.
In EU countries, you can't now buy a car with cash. You have to buy a bearer's check from your bank, which is expensive, requires that both parties have a brick and mortar bank, and doesn't work cross-border. Stablecoins solve this.
It was good while ago, but last time I bought a car I just did bank transfer. SEPA transfers are entirely free. Was kinda amazed that they just handed me keys when I showed them the receipt from my own online bank...
If you get scammed, it requires you to sue, many EU countries have very long waiting times for those, so you'll be carless and money less for a long time. Cash or crypto solves this elegantly.
Many EU countries have limits on cash payments, and the EU will enforce a union-wide limit of 10,000€ in 2027. Of course, this limit won't be reevaluated over time, so the real value will decrease with inflation.