That's the red flag, the thing you are trying to avoid. You don't want to implement things in each language and you always have more than one language even if y

That's the red flag, the thing you are trying to avoid. You don't want to implement things in each language and you always have more than one language even if you standardize (over time). You don't want libraries, you want services. This is why things like Istio are way better than libraries for mesh networking. Using external services for common things keeps you from being locked into a single tech stack and the limitations that entails.