It's been said a real car will have over 3,000 different physics calculations in play while in motion. (n4g.com)
In any case, the PS4 can process 1.8 trillion floating point calculations per second, which is 1.8 trillion physics calculations at a core level. (n4g.com)
Graphics rendering is BILLIONS of physics calculations performed 30 - 60 times per second... and you think the difference between say 2000 - 3000... assuming it actually used all real world physics... would make a difference to the quality of graphics? (n4g.com)