I'm not sure if I'm supposed to be impressed or worried here... It really doesn't look good there imo. Snake Pass almost give you the idea that Switch and PS4 is equally powered, the differences are very small in that game, but here... Yeah, no.
Granted, I haven't actually played TW3 on PS4 but the framerate in the second "less severe" example looks horrible from my point of view. :/
Still, I get your point, with enough downscaling we could run just about anything on just about any hardware.