I am a bit suspicious of these ideas. When I disabled parallel tool calls in my custom gpt5.4 harness, the quality of results went up dramatically. It looks like it's running slower and it probably is for some problems, but it's correct way more often than if I allow parallel calls.

I am perfectly content with a medium-speed golden goose. It seems to be a lot more predictable and happy this way. The business and other developers are already saturated by the serialized technique. Going faster would only serve to distract others at this point.

I think Navy SEALs have an apt slogan here.