But they are quite different. There are languages that are tightly coupled, but not true of all (like Go). You could write all your applications in the Go Langu

But they are quite different. There are languages that are tightly coupled, but not true of all (like Go). You could write all your applications in the Go Language, but use a transpiler. And as other comments call out, it is important to not conflate the two. A language issue is one that can't be easily fixed without breaking backwards compatibility. Compiler optimizations can be made (and is done all the time) without breaking the language.