NS-10s happened completely by accident. The story roughly goes like this:
Bob Clearmountain wanted a set of monitors light enough and small enough to carry by hand, so he could go from studio to studio and bring his monitors with him if needed. This provided him with a reasonably consistent mixing sound while working in otherwise very different studios. The NS-10s were not even designed for studios. They were home audio speakers.

Over time, legends developed around how they make your mixes translate better. Maybe so, maybe no. Likely depends on the engineer and source material. Plenty of great and terrible mixes have been made with and without NS10s.

The "NS10" of today is the iPhone. Some engineers literally mix to an iPhone.

My belief is that mixing on NS10s or other frequency-starved, frequency-odd playback systems is neither a necessary nor sufficient condition to produce mistake-free mixes. The evidence supports this.

I used to own NS10s. Sold them. Used to own an Avantone. Sold it.