1) Benchmarks ARE testing extreme cases.
2) Benchmarks predate need for “power”, but never for long.
3) Benchmarks predate new ways of using this “power”.
4) Benchmarks often point to weak points of objects they test. So we can see which one is good/bad at what.
5) Games never have enough power.
And again what is the point of benchmark when it is not measuring ANYTHING?