I never thought of that. I think Bethesda take their own lore too close to heart. I want to see people lieing throughout the lore. I'd like inaccurate books about vague details, or people talking complete crap that turns into widely accepted knowledge (like the potential for this). It would be nice, imo.
Buhwhat? I'm pretty close to Shangri-Lore, but even I'm hardpressed to think of a definitive in-game source about anything. OOC comments, sure, but they hardly count.
Granted, Redguard-through-Morrowind was superior in metaphysical/cultural world-building than Oblivion, and getting Tamriel closer to Glorantha, Ambergris, and Viriconium (to name just three of the best fantasy worlds out there)... but I don't see a gap so wide as the one you're crying foul on.
Things that, now that I'm older, I appreciate very much about Oblivion:
1) The singlemost awesome thing about it: that the Emperor was named Martin. Take that, Fantasy Tropes.
2) Pelinal. Sure, it was an add-on, so maybe it doesn't count. Maybe I'm also biased, but that's impossible.
3) Infiltrating the Mythic Dawn. I was tense, paranoid, and in a police procedural. Mankar was lying, wasn't he? Wasn't he?
4) Sancre Tor. Okay, so just what the hell is up with the Underking and Talos? For non-lore buffs, it's a fun space, with enough context to give it some measure of gravitas in the greater scheme of Cyrodiil's history. For lore buffs, who pay really close attention, this thing is exactly what you want it to be, Hircine-- is the Arcturian Heresy bogus? What's up with the Oversoul if this quest is happening? Wait, Reman's legendary heritage... am I actually inside the womb that carried him?
I ain't got no 5. If I could transplant one "easy" thing into in-game Cyrodiil it would be the cohesive-in-theme monster set from SI over to OBL's own very, very old skool checklist.
-M
Long-assed footnote critique of SI: The monster set is about all I'd carry over from SI, unless the whole thing was tucked away into the initial release of OBL. Its placement as an expansion was a very poor narrative decision. It should have been entwined into the MQ from the start; same with the commitment to show another side of Hell outside of Booga Booga Inferno. As an ostensible epilogue to the game (the date of it being brought to market dooms it to this, as does its title "Official Exansion", no matter the fact that you can install and play at any time)... it strikes so many wrong chords that it honestly becomes almost malicious to the main game, and plot, that birthed it.