Regarding the gaming on battery question, I think it's a valid use case for those that want to game on their commute etc. I have seen 100s of Laptop reviews on YouTube and the Internet of gaming laptops and no one ever ever ever ever reports on 3D performance on battery! Surely a core use case for a portable gaming computer. I applaud you for providing some small information in this area. My personal use is 100% gaming on battery (during commute) as you may have been able to tell. So, it is impossible to ascertain what performance I can expect from every other reviewer I've EVER seen other than yourselves!
I think you will find it interesting if you test 3D Mark and Witcher 3 on battery as standard in all your reviews. From your previous reviews it appears that it is almost immaterial which GPU you have, a 1050 is throttled back a little bit, but a 1070 is throttled back massively. For example you reported a 22% drop in FireStrike for the XPS 15, but when you reported on the Asus GL502VS, it dropped by 57%. I've looked at your reviews of everything from 970Ms to 1070s, and they all seem to throttle to around 6000-7000 on 3D Mark 11 on battery. Consequently on battery you get almost no benefit of a 1070 over a 1050. It would be very interesting to see if any manufacturer manages to engineer a battery subsystem that allows less agressive throttling of more powerful GPUs. Such a machine would be a clear winner for mobile gaming and practical given that many laptops ship with 99Whr batteries.