Thing is, you have an amount of RAM you really need. Put a bit simple, let's say your GPU benefits from up to 512MB. But it's actually neither fast enough in terms of shaderpower nor fillrate to utilize 2GB.
So there's just no need for a giant VRAM.
To some degree the same goes for main RAM. Good thing with unified memory is, you can still decide how many you want to use for what.
If Wii U did have lets say a 1,6GHz quadcore and a 640FLOP/s GPU (640 strem processors@500MHz) it could much better utilize more RAM.
Wii U as is doesn't really have that big need for more RAM. Less RAM for the OS would be fine though. Still don't see why it eats up half of the memory, 512MB should be enough.
Wii U is weak compared to PS4One, but actually pretty balanced. Except for the memoryhungry yet slow OS.
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