In Morrowind, the lore written in the books corresponded with that in the world. In Oblivion, we have pages and pages of the Adabala and song of pelinel, but not a whisper of allessian culture remains in the world
It wasn't an incredibly popular thing, even if its founder was.
but how many pagodas and daikatanas did the nobles of the Imp really have?
Considering that many nobles in the east of Cyrodiil were not actually Imperials, we can only consider three of them. And one of those does actually have quite a collection of Akaviri artifacts, so if we assume that a third of the region's nobility have connections to the Ayleids, it seems like quite a good representation.
I think that there's a reason that the quest was given to the countess, rather than another Imperial noble in Bruma, and there aren't many reasons other than the lore.
And as for the Renrijra Krin, we get the Adhijer Tra-not-even-going-to-try-to-spell-it, and a rumor that "the renrijra krin are just a bunch of thugs". We don't actually see anything in the game of them, despite the fact that their attacks are supposed to be frequent.
From that bit of dialogue, and others, I've actually worked out the economy and actions of the Renrijra Krin. It's just a theory, obviously, but is based entirely on what is said by NPCs and the evidence in the game. I also looked at things such as NPC schedules, things that are said in other quests, and a few locations in the game.
This is what we can get from what is said in the game:
'We need some law-and-order... bring in the Legions. 'Leyawiin for the Imperials,' I say. No sense coddling those Renrijra Krin bandits' - an Imperial in Leyawiin
'The Renrijra Krin are Khajiit bandits and smugglers posing as guerillas and freedom fighters' - the Count of Bravil's military advisor
'The skooma trade is making a lot of money for the tribes in Elsweyr, and a lot of that is going to the Renrijra Krin' - any person in the game
'Well, I don't know much about politics, but I think Lady Alessia's right. We've got to put a stop to all these bandits and rabble in the Trans-Niben. I know the Khajiit are all upset that the Council took away their land and gave it to us, but they just have to get over it! It's our land now' - an Imperial in Leyawiin
'Sounds like the Empire has given up on stopping the skooma trade in Elsweyr, and I hear tribal chiefs are supporting the Renrijra Krin' - any person in the game
'That skooma trade is bad business, and the Renrijra Krin are just a bunch of thugs' - any person in the game
'Leyawiin stands alone' - any person in Leyawiin, talking about what the count says, when you close the Oblivion Gate near the city
There's also the comments made by Alessia, about how Leyawiin needs people to take action against the Renrijra Krin themselves, the presence of skooma in the region, and the fact that the houses in Border Watch seem to have been occupied by raiders (the weapons and tribal system of the inhabitants are further proof of this).
Things like Garridan's Tears are meaningless padding if they don't tell us anything about the world, or have any effect on it.
The Akaviri invasion, Knights of the Nine, and Shivering Isles should have been of massive interest to the lore forum. But, because they were Oblivion, they were almost completely ignored.
How can you say that there are more unique landscape on oblivion? Just tell me 1 place in the wilderness/cities of cyrodill that looks like nothing we have seen before. Even the daedric realms were uninteresting. Only shivering isles had it more interesting.
Morrowind's regions were different paint textures. It was Oblivion that actually had more unique landscapes, because they were not just copied from another area. And, actually, most of Oblivion's landscapes we hadn't seen before, unless you think that they should take out the grass and trees.