Having your health be slowly restored after combat takes away the need for you to be cautious and plan before going into battle. It takes away the need for you to manage your resources properly and ensure that you have what you need before going out to adventure. Playing the game this way adds great depth to the gameplay and ultimately makes the entire experience more satisfying and immersive.
This is why I refuse to start playing the game until I figure out a way to turn off health regeneration.
