No because i have pair of eyes and saw that road to Anor Londo was walled off , reason probably because they didn't want you to waste time hiking unrelated areas and get to the point (or they run out of budget).
I like your use of Sen's Fortress to point out illogicality because it really points out the design differences between those two. You see DS2 has similar Sen's Fortress aka that windmill. You go up then you take at top of it elevator up and you end up in castle at top of sea of molten lava ? What ?
In DS1 you have walled up road and you are taken by those demon's up, while in DS2 you somehow magically teleport to some different realm. I mean if this was DS3 you could explain it via world converge but DS2 doesn't even try to explain that which is clear indication that those two was strung together because either they fucked up developement or someone was retarded.
I mean it could be literally fixed simply by taking elevator down instead and using some cave jpeg instead of sky.
As for rest about DS formula being those linear levels without tie to lore i don't agree. In DS1 and DeS almost every area was connected to lore and had reason to be there. So your position that this is somehow standard for DS doesn't hold.
I
do agree that you don't need to make every area tie to lore completely though. I do agree that concept of "journey" is in itself alone interesting. Problem is that you need to fill that journey then with really awesome areas like Shrine of Amana and since you actually don't need to care about lore then you go crazy with areas.