[Confusion]

  Someone actually took the time to sit down, ponder what kind of
  workloads will be handled by his application

The most important point made in this thread is that Zed actually didn't do that, but did benchmarks for a range of workloads, suggesting he intends Mongrel2 to be able to handle all of them. The question is whether that is necessary. If ATR > 0.6 never happens in practice, it will only unnecessarily complicate Mongrel2.