I think it's an elegant design that sidesteps many issues, and since bindings aren't involved you are designing purely in the language of choice. You can't expect every project to reimplement every library down to the stdlib.
You always cherry-pick the code you want, and in the worse case scenario you port it or the part you want from it (open source powa). Often, performance critical code paths of significant size are assembly anyway or when small, they are built-in to maximize inlining to avoid a function call.
And like it was exposed below: in this end, this is sort of not very honnest, because this is just another Big Tech engine front-end.
https://nyxt.atlas.engineer/article/technical-design.org
I think it's an elegant design that sidesteps many issues, and since bindings aren't involved you are designing purely in the language of choice. You can't expect every project to reimplement every library down to the stdlib.