Is it really necessary?

That choil is there, from what I understand, to remove the stress point where the thin edge of the blade meets the thicker edge of the tang.
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yeah, this means that flex in the blade as a whole is not transmitted along the edge to a suddenly massively thicker piece of material, resulting in nasty stresses at the transition point. I think it's also supposed to reduce stress risers that contribute to cracking during heat treatment.

From a user's standpoint, it means you can actually use the rear of the edge to cut up against things sort of as an aft point that would be otherwise nearly unusable for many uses.

I do knives with and without it. For some I think it's important. It also depends on the design of the handle/guard and transition areas.

-Daizee
 
I ran a dremal tool up in there and made the edges more squared off and it's the best place ever to strike a firesteel.
 
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