I think with context 7.0 to 7.3 makes more sense at least in terms of Heritage Found and Solution Nine. As they played with a lot of themes, which many got caught beforehand. 7.3 is the bow the neatly ties the themes together.
What themes? Well, to elaborate
- It was very early on noticed by users in 7.0 that the Queen Sphene is basically a ghost that body hops from robot bodies that are basically her personal undead soul-sucking army.
- The whole thing revolving around souls and how souls were treated as expendable regardless of who the soul belonged to in life and that in turn the citizens were willingly acting as if they are soul-eating liches in order to preserve their own existences.
- How the arcadion's main form of entertainment is through combatant's using beast souls to become more powerful yet in the process each usage effectielly shortens their lifespan.
- That of the real sphene, after her data self is gone, is released, effectivelly a resurrection of her yet with none of the memories that her body-hopping self accumulated over centuries.
- How Calyx and like-minded researchers sought to become endless, basically digital ghosts so as to live forever, and that Data Sphene and Calyx's plans is to create endless ghosts that seeked to harvest aether across the stars and shards.
- How from 7.1 to 7.3 the ramp up of a cult that is obsessed with death and wanting to live forever thanks to the data ghost that is Calyx.
- That the deaths the citizens experienced from 7.0 to 7.3 was only meant to sow fear but specificially the fear of death, to reinforce belief for Calyx's cult to work.
- Necron itself, its name, the arena being called the ageless necropolis, how they get stronger from experiencing death as the primal fears it, how they fight in a very necromancy sort of way. Its all basically the writers yelling to the people in the back that haven't noticed.
- Especially when they intentionally have the robots moving around like one of the various undead enemies in how they lurch and stand, of the backwards head turning.
All of that is to say, beneath the dressing of technology and science-fiction, its just effectively a necromancy-centric civilization. The reason the writers do it this way? To obfuscate and to turn into a slowburn as they probably didn't just want to do a complete copy-paste of Mhach again.
I wouldn't be surprised if the writers had at one point saw one of those video essays that went over how undead might fuction as a labor force. Especially with the plot point revealed that the robots couldn't simply be shut off as they handle much of the labor required to keep the city running.
Especially given how this will make the second time Duskwights, when given more of a spotlight, are associated with a society that has necromancy themes. The first being Palace of the Dead, aka Gelmorra. A shame this still advances nothing about Duskwights of the source and only those of Solution Nine.