That would only really work if I already had the hardware for a meaningful benchmark. Right now my desktop has a 5950x and my laptop has a 6700hq. Showing a benchmark between those two systems would not be that interesting. I would like to show how my system performs on a 7950x vs my 5950x but I don't want to go out and buy another $2000+ computer just to get those numbers.
And then there is a greater chance that phoronix will include it in its tests; or others will run it and publish the results.