I think this is the only part where I disagree with you. You're judging Skyrim's main plot against Dark Souls lore and world-building, which honestly I don't think comes close to TES lore at all (a lot of which Skyrim has, Morrowind wasn't the only lore intensive TES game). And if we're counting in watching lore videos for DS, then we should be able to count wikis and lore videos for Skyrim, which just makes Skyrim come out even higher in this regard.
Basically, if you're going to judge them both on story, then judge them both on story. If it's lore and world building, then judge them both on lore and world building. It's unfair to compare Skyrim's main questline with Dark Souls' entire lore, which is what you seem to be doing. Everything else I practically agree with, though. I mean, I'm not a fan of Dark Souls combat personally, but anything is better than TES combat lol.