Not sure how old the relevant posts are, but in regards to your post of the Glistening Oil containing memories of a time before Yawgmoth:
You said that Phyrexia is driven by his legacy, his goal still pushing them to conquer, and while this is true, was it not established in New Phyrexia that the Mirran-born Phyrexians, Praetors incldued, have no knowledge or memory of Yawgmoth or Old Phyrexia?
I think there's a subconcious drive, and it's definitely dominated by Yawgmoth's megalomania and its overwhelming imprint on the Oil, but they'd need to go back pretty far to even reach that, much less further before that.
They do have at least some memory of both of those things (though it is indeed harder to dig back to Old Phyrexia times).
They possess only a vague understanding of the past. Dim recollections of the old ways have been passed down to them through impressions in the glistening oil.
The praetors and their followers do know of Yawgmoth, they just mostly believe he was weak or flawed in some way for having been defeated. Jin thinks he lacked logic:
While acknowledging and appreciating Yawgmoth's cunning, vision, and ambition, Jin-Gitaxias feels that Yawgmoth failed because he didn't think things through.
Vorinclex knows full well that Yawgmoth existed, but doesn't respect him:
The green-aligned faction doesn't revere Yawgmoth's memory. They believe his defeat is a sign that he was not the true Father of Machines, and faith or reliance in a single leader was a bad idea.
As for memories of Old Phyrexia itself—Kraynox, the Deep Thane, specializes in ichor divination specifically to get as far back as possible, and he knows a lot about the geography and structure of Old Phyrexia, so much that he's trying to replicate it by creating an oil layer. He's so into this whole thing that he even unnerves other Phyrexians, who see him as cryptic and detached from their present reality. If anyone was to gain some great revelation from oil memories in pre-Yawgmoth times, I think it would be him.
