Yeah, I've read a lot about that and you're right about the NS10 myth but there's the other side of that which is the legend of the NS10!
However, the facts still stand and that was most studios in the 80s and 90s had them and it did led to decades of excellent recordings. According to the SOS article that I read, most of what you say is correct as they did an analysis on the frequency response however as you say, neutral sounding speakers is what is generally recommended and yes, you could achieve a response similar to the speakers by using an equaliser but if that's the case, why didn't producers like Bob Clearmoutain think of that 30 years ago? There are other factors here and that is while you can try and create a similar frequency response using an equaliser, it will never be exactly like a real speakers response due to resonant frequencies which are caused by things like the cabinet, etc and these aren't constants so while the bass may appear to start dropping at say 100Hz, you may find that there is a sharp peak at 72Hz and similar peaks and troughs throughout the frequency spectrum.
I know this as I worked many years for a respective speaker and audiophile company who used to supply speakers to studios, the BBC and consumer markets.
Whenever we wanted to see what was so good about the opposition, we always pitched our speakers up against the competition and took measurements from them while they were suspended in our anechoic chamber. I can tell you that before general computing power became the norm, this was a very time consuming process and while you would try and re-create the same response, the other factors such as cabinet & cone material could interfere with the equation as they could produce a frequency curve which looked like the tops of the Himalayas! I could go on all day about this but it would get boring.
Don't get me wrong as I agree with most of what you've said but in my humble opinion coming from my experience, there's got to be a very good reason why respected people like Bob Clearmountain swore by these speakers for two decades as did others and I'm sure they would've thought of using and may be even tried an equaliser. I'm not sure you could achieve exactly the same with an equaliser as it's a precise box of electronics or a VST emulation which has a finite limit of combinations against a speaker full of resonant frequencies which are far more unpredictable and can even change at different volume settings and that's when measured in anechoic chambers which means that's without considering the studio's room acoustics let alone the listener in their home.
Bottom line for me is that I reference against 4 sets of speakers, ones which are very high-end, these recent bog-standard consumer speakers and my car's speaker system comes in to this equation as I always test my mixes there too!
I'd actually like a producer who used these for years and swore by them to pitch in here and state exactly why they used them extensively and didn't resort to emulation using different speakers and equalisation.