Thankfully Anand doesn't test hardware only for you. He tests it for people who are actually relevant, like me. In order to put together builds for people I need to know where the performance lies in relation to alternatives, and
nobody tests discrete GPUs on Low.
Honestly, your complaints don't hold up to the barest of scrutiny. If games can be scaled down to be playable for the notebook reviews, why do you need to see them scaled down to see if they're playable on a desktop APU?
Oh gee, I wonder if I there is any setting that would allow me to play Skyrim at better than 21.6 FPS on an A10-7870K? How ever could I figure this one out?
You're desperate to get one word that you can use in your internet fanboy arguments: "Playable." But the tailor-made settings you ask for are useless to everyone else because nothing else is benched at those settings.