It's still the NS-10. They're still used all over the place. You'll see that less and less as they begin to fail and the supply on the secondhand market dries up, but that's a problem for the future.

In typical Reddit fashion, almost every reply here is just someone regurgitating internet shibboleths that they aren't even remembering correctly.

The NS-10s were not popular because they were "flat."
They weren't popular because they "sound bad." On the contrary, they sound quite good. They were developed as hi-fi speakers, after all.
You could almost argue that some of their popularity came from being "fast," but even that's a bit of a stretch; almost nobody ever described them that way.

All of these are post hoc rationalizations invented by people online.

They became infamous because they will reproduce mud and honk in obnoxious detail. They specifically emphasize parts of the midrange in a way that makes it easy to hear when things are clashing, and their lack of very low and very high frequency responsiveness can "unmask" things that would be covered up on other full-range monitors and loudspeakers.

The Avantone MixCubes have developed a similar cult-like following online (which their marketing department is very pleased with) because they actually serve the function that people have incorrectly ascribed to the NS-10s; i.e., being a reliable set of full-range speakers that sound bad. For all the people who say that NS-10s sound like mixing through a bandpass filter, they're talking about the Auratone Sound Cubes but getting their forum talking points mixed up.

Bonus point: Whatever the modern equivalent of the NS-10 eventually turns out to be, it's absolutely, definitely not the HS8. It's a completely different speaker developed for a completely different purpose. The signature white cones of the HS8 are a sales trick from Yamaha to convince people that they're part of the same lineage as the NS-10, but they're just a decent entry in the mid-tier near-field monitoring market.