No it's not really necessary. For many trades a van or a small box truck is more practical. It's what most of the world outside of North America uses.
Pickup trucks popularity as a status or recreational vehicle has heavily influenced the modern design. It's made the newer models harder to use for work without significant modification.
I have driven pickup trucks for work for 20 years now. It's gotten so that I dread having to purchase a new one. It seems like every new model has more "features" to break.