Seems like a poor example since CPU performance metrics differ not only between ISAs, and between vendors of one ISA (AMD vs. Intel, for example) but also between items from a single vendor. There's a 1000-page PDF that tries to explain what all the Intel PMU counters mean on different CPUs and it's full of errors and omissions as well.
Yes, but these differences don’t really matter. There are multiple techniques that system engineers can use to perform both variable selection and regularization (to help with differences across multiple architectures) to help them select counters that matter for their specific use cases.
But then saying “it is too much to ask” is just another way to limit what user can do with the specific resources they paid for.
