Well my Surface Pro 4 has an history of his own as it was exposed to a good number of mishaps in very challenging operational environments, meaning highly unreliable electricity supply, dust/dirt/water, shocks, charging cycles unpredictable and IT support do it yourself that is better. All this resulting on need to replace display, motherboard and battery. On the plus side, very easy to stow in any possible bag, less than 1Kg, very nice display, powerful I7, 8gb memory, SSD only and 6 years gone still working pretty well. As far as IL-2 is concerned this is what allowed me to stay in touch with my favorite hobby and I can run "Black Death" in UP34 using directx with average 60 fps, with no texture compression, all the video setting on high except the shadows, landscape lighting=2, water=2 and effects=1.
Strange thing I started to notice the problem with the DPI setting when I changed my additional microSD with a more capable one and took out the BitLocker encoding to facilitate the swapping of the SD.
However as I have reached the end of the professional (always on a luggage) life I will maybe transition to a more stable alternative