The point of most such caveats is that for any non-trivial benchmark, implementation details will inevitably be different enough that it's unlikely a single ben

The point of most such caveats is that for any non-trivial benchmark, implementation details will inevitably be different enough that it's unlikely a single benchmark result will give you much information in general about how to compare the two languages. But the other thing I'd say is that speed of execution is only one of many, many factors to consider when choosing a programming language for a project, and it's very often not a very important one.