That's right, the US are fine with stablecoins, they essentially serve the same purpose and USDC for example are controlled by US corporations. XRP also have banking relations.
It does make sense to wait until it's perfect before rolling out, though what doesn't make sense to me is why so many CBDCs exist. I could only imagine that it is due to so many different programs to waste money on research and development.
Many want their own currency to tweak it to their own desires and specifics.
That's a fair point, though this just goes to show that governments and institutions aren't learning from what works - open source development. Imagine if the world came together to build a CBDC solution in an open source way? It would save a lot of time and resources, and encourage collaboration on a global level. I know that this is an optimistic view, though it is something that could easily replace the fragmented development.