The the whole benchmark discussion becomes moot, doesn't it?

Benchmarking a processor for real-world usage is definitely something you can do.

Benchmarking a processor for "app written by someone who disregards performance" is something you can do, but it's a bit of a pointless exercise; no processor will ever keep up with developers ability to write slow code.

An important question people care about is "will my day to day computing improve with the new processor?".