Yeah but ABI stability isn't really just magic dust you sprinkle in you language/compiler and make it more stable

It's a straightjacket that has application in few select cases.

Things ABI prevents in C++:

- better shared_ptr

- adding UTF8 to regex

- int128_t standardisation

- make most of <cstring> constexpr

And so on: https://cor3ntin.github.io/posts/abi/

I get you might have particular criteria on this. But it's a feature that comes with huge, massive downsides.