Go is meant to be fast. The choice for pass by value or by reference for each embedded type was carefully chosen having that in mind. Pass by value reduces the heap usage because function calls can make a value copy instead of keeping the value at the heap. Whenever a value is passed by reference the compiler must keep the value in heap, just for the sake of sharing the address. Reducing the heap usage alleviates the load for the garbage collector resulting in improved overall performance of the generated code.
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