While physically based rendering is a very nice idea, one has to be careful not to turn it into an ideology. Specifically, in production, you very often have a

While physically based rendering is a very nice idea, one has to be careful not to turn it into an ideology. Specifically, in production, you very often have a situation where the artists wants to produce a specific effect and are simply prevented to do so by the rendering system because it strictly adheres to how light would behave in the real world. This very severely constricts creative freedom and is one of the reason why these types of renders are used sparingly in actual VFX production. The luxcore PB render, which someone mentioned in another comment, is a very good example of what I'm talking about: produces really nice realistic images, but it is darn near impossible to get it to do what you want when tweaking a shot.