EVERYONE IN HERE WHO SAYS STAT SQUISH IS NOT NEEDED IS PATENTLY INCORRECT. PLEASE READ THE FOLLOWING AND CORRECT YOUR FLAWED KNOWLEDGE OF HOW THINGS WORK.
Let me tell you something about how 32bit and 64 bit systems work. They are defined by a max number of integers. In this case, the number that defines 32 bit systems is 2,147,483,647. You see, that's 2 billion and some change. 64 operates at a much higher number, but not everyone has 64 bit systems.
What this means is that the maximum health for a boss in the game is around that 2.1 billion mark. Heroic Garrosh had 1.8 billion, and heals enough times to get to around ~8 Billion health on 25 man. It is basically impossible for Blizzard to maintain a fluid experience under the current system, and a squish is ABSOLUTELY necessary based on the simple computational mathematics, and the limits of 32 bit systems.
Please do not try to pass off opinion as fact any more without doing research.