It doesn't help that the last flagship tablet releases by Samsung (the Tab S2) and Google (Nexus 9) were not only expensive, but disappointingly 4:3 aspect ratio, making them poor for games and videos. I think Samsung's Tab S 8.4" and 10.5" tablets were the pinnacle w.r.t. the display on an Android tablet and there's been nothing since then worth buying. Heck, Google completely ignored tablets at their last launch, instead flogging clearly overpriced phones. If a Samsung Tab S3 came out with a 16:10 display like the Tab S, but with more RAM/faster CPU/GPU, then I'd probably first in line to buy it.
It's sad that my venerable Nexus 10 is still pressganged into service (with CyanogenMod on it of course, like all my tablets) - it was the last decent large tablet Google sold. It's no wonder tablets are dropping in sales - the Android tablet manufacturers in particular have almost given up making an effort to create a decent tablet. Yes, I know about the Yoga Book, but the price is a little steep considering the specs aren't fantastic and you can't detach the display and use it as a standalone tablet.