about high resolution and impact on noise and people wishing Nikon provided lower resolution camera with better low light performance.
There is no strong relationship between photosite (pixel) size and noise per unit area (which is what really matters). Smaller noisy photosites covering the same sized area as larger less noisy photosites can have exactly the same dynamic range.
Smaller photosites (high resolution) is important to certain photographers and the D800 is certainly aimed towards them.
But smaller photosites don't come without a price. File are larger. There is more data to read out so frames per second drops. Softening due to diffraction occurs at lower f-numbers. Etc.
Many people would have preferred a different trade-off, and this is what I think you're hearing.
instead of 7360 x 4912 have it set up for 4256 x 2832 for example), would than improve the low light/low noise performance
Setting the D800 to capture less than the full FX sensor will sacrifice dynamic range. You would lose over 1 1/2 stops of dynamic range going to the size you indicated.