I must protest the use of performance mode to run benchmarks on this laptop. Performance mode does not allow dynamic boost to engage which means that you are not truly measuring the full capability of the laptop.
Performance mode lowers the GPU clock signficantly. Turbo enables the extra factory overclock that Asus sets. If you reviewed the Zephyrus in performance mode as well, you are leaving a lot of performance on the table.
The first reddit benchmark, even before the latest drivers were released, hit 22K in Fire Strike Graphics, and 8.4K in Time Spy. These are significantly higher than your benchmarks. I game with a noise cancelling headset, and I don't care about fan noise. I would use the max power settings which is Turbo mode on this laptop.
On some laptops, there are diminishing returns to using the highest power settings, but not with the new Asus laptops. Lower GPU clocks and power draw in Performance mode make a HUGE difference in gaming performance.
Finally, the PC Mark 10 score was only about 10% lower than your best score! For some users that will not perform a lot of multicore heavy tasks, the loss of 10% is not significant especially since it laptop can run all day on battery power. Might be the right fit for a student on the go that will not need to charge it during or between classes all day long.