When you’re on a long flight, have you stopped yourself from playing a mobile game in order to conserve your battery? Have you experienced too many stutters when you play a visually intensive title? Do you think it’d be helpful if you could choose a phone to suit your specific needs, based on public data about how well each model handles the best games and apps?
Smartphone and tablet reviewers try to distill their sense of how well a phone performs, but no matter how good their intentions, their conclusions are inevitably subjective and anecdotal. That’s why a market has developed around benchmarking apps like GFX, CPUBench, AnTuTu etc.