As mentioned in Chapter 8, post-processing effects are an essential part of obtaining physically based shading. The need to use HDR makes it a must to have tone mapping, which is best implemented as a post-processing effect. When you have one post effect, you might as well add a few others in, such depth of field or bloom.
While the new official Post Effects system available on the Unity Asset Store is very powerful, you might still need to implement your own tone mapping, or some other post effect that Unity does not include, so it ...
