> The direction we're heading is to provide POSIX compatibility as an emulation layer on top of a cleaner foundation, rather than just doing POSIX at the base layer.

What's that "cleaner foundation"?

Next thing is: POSIX is the legacy stuff. If it's there nothing will change.

And not even to mention that the stack is going to look something like:

Hardware >> Hardware emulating some ISA (e.g. x86) >> C abstract machine >> POSIX >> VM emulating some ISA >> "container" emulating POSIX >> WASM VM >> emulation of POSIX APIs >> legacy applications written for some ISA & POSIX

I call this construct "layers of madness"… ;-)