See, with speed runs we're comparing players - people - on the charts. There is no chart about Grand Poo World 2 versus a Quake Total Conversion, the chart is like, OK, Poo is very good at GPW2 and Panga isn't as fast, but Tofu is faster than Poo.
And I can believe a chart could tell me Bob the C++ programmer is better than Jim the C++ programmer at some task a community of C++ programmers agreed on.
But can it tell me that Bob the C++ programmer is better than Sarah the C programmer? Or more so, that C++ is better than C? No, the C++ and C communities are going to disagree about how to measure this.
And I can believe a chart could tell me Bob the C++ programmer is better than Jim the C++ programmer at some task a community of C++ programmers agreed on.
But can it tell me that Bob the C++ programmer is better than Sarah the C programmer? Or more so, that C++ is better than C? No, the C++ and C communities are going to disagree about how to measure this.