I wasn't going to be drawn into this part of the debate, but....
Your take on the Soul part is probably going to differ depending on where and when you first found the music..
I was a mainsteam(ish) Soul fan first and kept hearing things that were a little different to that and wanted to hear more-saw the adverts for The Pendulum, went and had my head blowed off...so to me the Soul part was the most important element (yes, I did listen to and to some of the Pop stuff--duidn't we all???)
It was called Northen Soul by Dave Godin in his shop to differentiate the type of SOUL northerners wanted to buy from the funkier type stuff coming into vogue in the SOUTH.
If you joined as a Post punk new wave Modernist, you take on the desirabilty on the Soul part of Northern Soul may be different to mine.