Why do Harbeth speakers have such a cult following

For me Harbeth speakers walk that fine line between being overly detailed and being boring.  They seem to capture every nuance of each instrument and vocals and do a great job of separating them without distortion or glare.  They are also very dynamic with, with notes coming from seemingly nowhere instantaneously.  I wish I could put it into words better.

I've been listening to Steve Miller's Welcome to the Vault the last couple of mornings on Qobuz on my little computer system with the P3ESR SEs, which I picked up for $1400.  The cymbals, the drums, horns, vocals, guitars... everything has so much detail and with a little help from a SVS SB-12 NSD subwoofer, the bass blends perfectly.  When listening to some of the live cuts, I feel like I'm sitting in the club with Steve and the band.  All of this in a small room with wood paneling, no room treatment, the speakers stuck in corners, and me sitting at my computer, about 2 feet in front of where the speakers are.  In a good room with proper set up... 

I've heard "better" speakers, but I can't think of any that I enjoyed listening to more (including my Super HL5 Plus).

I listen to rock primarily.  Some of the other speakers I've owned did some things better than my Harbeth Super SHL5 Plus.  My Legacy Audio Focus 20/20s and Klipsch KLF-30s conveyed more sense of scale and dynamics because they were larger speakers with more drivers and greater sensitivity.  They just move more air.  If you want to fill a room with sound and really rock out, those are great speakers.  Where they lose out to the Harbeths is on clarity and neutrality.  Instruments and voices tend to get pushed together more and at those higher volumes they can start to lose cohesion and start to hurt my ears.

Now that I'm approaching 60, the kind of rock I listen to is more stuff like Steely Dan, Pink Floyd, Jimi Hendrix, Santana, Steve Miller, etc.  I am not usually listening at high volumes, and I enjoy the nuances of hearing every instrument clearly defined and listening to the words and musicianship more than ever.  Which isn't to say that I haven't played some Iron Maiden, Tool, AC/DC, and the like through the Harbeths.  They can rock and can go loud without the harshness of many other speakers.  Having 4 subwoofers assisting them also helps make up for the smaller size of the Harbeths and gives things more of a "live" feel.  

I get that what sounds harsh to me can be appealing to many. I belong to a local music club.  On a number of occasions we've listened to a system consisting of either a Primaluna integrated or Anthem Integrated and a pair of Klipsch La Scalas.  I love Klipsch speakers, but the La Scalas hurt my ears at higher volumes.  When we cranked them up I couldn't wait for it to be over.  The other guys all loved them.  When I first heard a pair of Harbeths I fell in love with the sound and agree that there are some trade offs, but overall they do so many things right.