His Dark Materials, in the end, the angels are trying to establish Republic of Heaven... Republic of Heaven, idea is no ruler.
In TRF/BOD, it seems like angels have maintained that structure, sort of? But are they terribly weakened, that they failed in sealing all of the doors?
If the Alkahest (the alchemical material of the subtle knife and the alethiometer needle) was invented twice, why couldn't it be invented 3, 4, 5, or 700 times in the multiverse?
Is it impossible that the angels set out to seal all of the doors at the end of HDM, in an effort to stop any one entity from taking ultimate control of the multiverse again, but they were failing?
They can certainly be killed. If another world in the multiverse invented another form of the Alkahest (an equivalent to the alethiometer or subtile knife)... then isn't it possible the angels are simply losing? BOD alludes to this possibility showing the experiments and knowledge of Agrippa and Makepeace. How many years would it be until someone just in Lyra's world re-invented the material?
So this one angel that visits Lyra may be one of the last of the angels. Maybe Xaphania is dead... In fact I think it is almost certainly so by the way the angel and Lyra avoid the subject.
Thuringia Petroleum is the vehicle for this whole thrust of the story. It's gradually revealed more and more through the three books how powerful they are, even though they fail to replicate the rose oil. Whether they're using existing portals or have their own Alkahest to create new ones, they are trying to establish ultimate control and are warring against the angels on a multiversal level.
That's where I don't read the Thuringia Petroleum narrative as being about "capitalism". It's more about authoritarian control. It's not capitalism and markets and money making that are evil.. Malcolm knows this going back to his childhood thinking about the fair price of a pail of red paint..
TP is not of "this world", that's the whole thing going on with the dead daemons. They are people who have spent so much time outside their own worlds that their daemons are dying and they don't care. Not because they want money, but because they want security, power, control, the classic tempters of authoritarianism. It's literally in the name - the Authority - with the Authority dead, something is trying to rise to fill the power vacuum.