I agree with you with the Surface Book 2 it's powerful, light and all however the problem is the Cooling so when you play heavy games I doubt that it will throttle when running heavy games around 30 mins or so. that's the problem with slim chassis
Aorus X5 V6 is the best lightweight gaming machine I've ever used/owned. With 3 m.2 slots plus the SATA connector and 4 RAM slots it's also the most expandable. The 6820 and 1070 work in perfect harmony, screen is wonderful, and battery life is quite amazing-- truly unsure why it isn't on top of this list.
and the series MSI GT62 and GT72 integrating a GTX1070...lot of troubles on those ones as described on the US, German and French forum...multiples crashes, issues with speakers and so on...so far MSI doesn't seem to account all this troubles...and they last since already 3 months.
The first item on your list, the Acer V15 Nitro Black has a link to Amazon for a price under $600. This is not the laptop you list, but an inferior model in processor, ram, video card and graphics memory.
Please update the link to accurately reflect the updated notebook. One that meets your specs comes closer to the prices of the other notebooks reviewed.