If I recall correctly, the dwarven system ending was because Mathilde had narratively reached the point where the Karaz Ankor was having trouble not acknowledging her as a dwarf in good standing—and her past actions thus being reflected in that light to make her a very important dwarf—and thus respected enough that most things favour would be spent on are expected. Also the mechanical bits, yeah, but narrative has a part to play.
As for it not matching 1:1, everything so far has. Boney changing that now probably would count as breaking the system.
There was also a vacancy. Algard seems unlikely to leave the Grey chair any time soon.
Bit late for that,
Also, trying to shove us at a Matriarchy would take us away from our current process of groundbreaking research and troubleshooting for foreign polities that made us so well loved in the first place.