Yeah the background sim is one of those things where I assume they simply must be able to get some form of working MVP out, at minimum. In theory it'd run on its own servers at heart, and so be firewalled off from many of the performance and networking issues of the core game in that sense. (Forgetting all the spangly emergent 'Virtual NPC' / Subsumption stuff that's supposed to spin off from it).
That said, here we are years down the line, and years after the
claims of imminent delivery, and we finally see a Tier 0 snippet in 2022... Which suggests mighty struggles somewhere with even the core implementation. God knows why.
(Kinda reminds me of SQ42 in that sense

. Should be chunky but straightforward dev in theory, but they've managed to make it a hellish Sisyphean challenge along the way...)
Thought Ray's take on the initial implementation was interesting:
Source: https://www.youtube.com/watch?v=lwVvrcvp43I&t=375s
TLDR: The bones seem to work. But are useless for now, as it's all completely uninterrogable. (IE: Where are the best fuel prices, where is it less expensive to repair, where is the increased piracy actually happening?)
(Some slightly delicious potential in there for prices to go insane on certain key services, and for nobody to be able to figure out why, or what to do about it

)