I never use stable coins for payment, and I don't know anybody who does despite being in crypto since btc was at $8. I do pay stuff in BTc and get paid in BTC once in a while and see people in my bubble do the same. We use stable coins to limit taxe exposure, mainly.
It's true eth has never been a mean of exchange for any of us and more a platform for smart contract (my friends at kryll.io use it for that).
The majority who trade crypto use stablecoins for payment all the time. It's the default on most exchanges, and for a lot of the biggest pairs on DEXs.
If you are talking about payments of non-crypto products, I was exploring the hiring for small jobs subs on reddit yesterday and the two main accepted means of payment I saw seemed to be PayPal and stablecoins.
It's true eth has never been a mean of exchange for any of us and more a platform for smart contract (my friends at kryll.io use it for that).