>>I might a possibly would get the same answer or might think to myself these are in the middle of an evolutional change from viper-elapid or vice-versa.

While physical descriptions have been used (almost exclusively until recently) to classify animals into taxonomic groups the whole point of animal taxonomy is to put them into a "tree" desribing the path by which they evolved from the first living organism.

Even if the death adder eveloved to a point where DNA analysis was the only was to distinguish it from a puff adder, it would still be an elapid, just one that looks exactly like a puff adder. It's appearance does not change it's lineage...

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