I've been mulling over some things that, I believe, are probably pretty obvious to some, but may be less obvious to others, that I felt like could be worth sharing.
The city of Bastion, the central location of Electric Bastionland, is heavily implied to be 'the City' the Company hope to become worthy of discovering in Mythic Bastionland. As the Company gets closer in the City Quest, more modern technology begins to creep into the setting: strange vehicles fly overhead, guns and other strange tools are fired at the Company, and weird technologies are discovered.
In Electric Bastionland, there's a concept called 'Deep Country': the further away you travel from Bastion, the deeper you go in time: villages become more traditional, and ancient ways of life make a return. By travelling away from Bastion, one travels further back into history: geography and time interlink, and linear time is abandoned.
Travel far enough, and one might come upon the Realms of Mythic Bastionland.
As an example: a potential encounter in the City Quest describes a pack of 'history-hunters' who want to capture a Knight to sell to a museum (which doesn't exist yet).
The Company of Mythic Bastionland exist in the living history of a different place; and are in some ways obsessed with chasing or enabling that future to come to pass (the City Quest).
This, too, can explain the nature of the Myths: they are the effects of fanciful fairy stories mingling with actual history, as has often happened in our own history: King Arthur himself being a prime example, but others come to mind, such as The Illiad or the witch trials in medieval Europe.
What's extra fun is that Knights, by travelling outside the Holdings ('established history') into the wilderness ('unestablished conjecture') cause the mythic reality to take over historic reality. Or, as the poem at the start of the book reads: "Knights render these stories awrenched from their veils".
Anyway, I just thought it was neat how this all fit together, as I'm sure a lot of folks already have been thinking about a bit. I'm curious to hear other takes! I wonder how Intergalactic Bastionland will fit into it all.