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dhphoto, from your perspective...what is a need? Autofocus accuracy...we used to shoot just fine using manual focus. High ISO...I remember when ASA 400 was high. Better noise handling...today's DSLR are miles ahead of the old film day. What then is a need for you?
A need is by definition something you can't do without.
More Dynamic Range is not a need, it's something some photographers think they want out of their camera sensors, almost as if they can't do the job properly otherwise.
In photographic terms we haven't been limited by not having Nikon's current of dynamic range all these years, we worked round it or, more likely we never even noticed. We just did the job with the tools available.
It's like NEEDING ten frames per second, you don't, you might want it, put the job can be done without.