Because you get higher benchmark score. You optimise your code as best you can, you get correct rendering, and then a little cheat on the water IQ and you get a 7 percent speedup for reviews. Do that in a couple of places, and you're into significant speedups. Then a release or two later, you can "fix" the rendering, and go back to correct visuals at a slower speed.
In the meantime you've had great reviews, and trumped your competition on the benchmark scores.
I don't know why your so disbelieving, we've seen this kind of thing plenty of times before around the release of a big title.
			
		
 
	
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