That is a big thing. As covered in the Pinkbike video, they have used it since they bought it from Horst back in the early '90’s. I lived through this era and as a budding designer, poured over each and every full suspension design with a fine too comb.
The FSR / Horst Link provided real advantages over other designs of the early era. But as more smart people (Dave Weagle, etc.) got their heads and hands into suspension design, non-FSR designs gained performance and use among other brands.
Despite the drop of FSR for the carbon bikes, it remains on the aluminum bikes, so they are still placing their emphasis on the design until they figure out the next step to eliminate the bearing pivots. I envision them doing a hybrid aluminum sections with a short carbon section in the seatstays or chainstays in the future, but who knows.
Overall suspension design has gotten so good any more, that there aren’t any really “bad” designs. There are more choices about characteristics, like picking primary bike categories. Sounds like the new Spesh rears are better in some ways due to kinematic and shock changes. Those sound good to me, as I have loved all my FSR bikes, but noted the somewhat sluggish feel (specifically out of the saddle efforts) when compared to other designs (DW Link in particular).