The major benefit of the US Dollar is that you can do things with it. Between export controls, currency controls, laws on foreign ownership, etc, china can pay me all the RMB in the world. I still can’t do a whole lot with it.
It's more of a payment processor issue than a device issue.
If you are in a country or area with a large Chinese population, you can usually pay easily in RMB with Alipay.
If you use Visa and Mastercard, you are subject to US regulations, sanctions, and embargoes. Many alternative payment processor exist, PIX in Brazil, UPI in India, etc.
There are several systems in the EU: Wero, Bizum, BLIK It is urgent that Europeans coordinate to ensure the interoperability of these systems and reduce the influence of Visa and Mastercard.
In the event of conflict, this will be the first service to be cut in order to disrupt European countries.
The US already use it for coercing European politicians : https://www.courthousenews.com/eu-strongly-condemns-us-sanct...
You can buy with RMB in a lot of countries outside the West, if they have integrated UnionPay or AliPay into their payment processors.
But more importantly, you can buy a lot of stuff from the factory of the world. Which is why a lot of countries don't mind holding the RMB. Just not enough for it to become a reserve currency, and certainly no one wants it to become the petroyuan.
This is part of the same reason many people don't use Bitcoin- you can't actually do much with it because retailers don't accept it. But China is definitely thinking about how to fix that problem, and soon they will make it possible to pay directly in CNY in other countries. Once you can buy things with it, the CNY is attractive from a practical perspective. A lot of your stuff is already manufactured in China, once/if using CNY makes your purchase easier then it's going to gain ground on the USD.
https://www.atlanticcouncil.org/blogs/econographics/what-to-...