You bring up a good point, we know Mr. Fantastic is in Earth 838, there's at least reasonable chance Doom also exists in that universe and Mordo would be one person most likely to seek his aid to hunt down and get vengeance on Strange for the destruction of the Illuminati. When it comes to Strange he does not exactly have the clearest vision at the best of times, and he's just lost everything.

They have plenty to work with, they just have been less open about showing their hand than phasds 1-3. This is a good thing, I think. With the infinity saga, we (comic fans) all knew he would collect the infinity stones and use them. There was no surprise. With this saga, there's a few plausible paths to give Doom his endgame, so they can lead the community with hints and subterfuge and maybe actually provide a decent surprise at the big reveal. We'll see whether they can pull it off, but if they manage I think it'll be huge.

There was one 'rule' that I know was broken. It's one of the world rules, 'no paper'. They used a paper note in one of the episodes (it could have been a different material but the rule isn't literally about paper but the absence of hand writing materials in general, indicating that technology has become so pervasive that even something as simple as a notepad is handled by technological means)

This is kinda legacy to the Zelda franchise. Nothing saying they can't do different in a new iteration, but Link has always been a mostly solo character. If anything, botw and totk have reduced how solitary Link has traditionally been by adding active characters, even fighting with the militia proving that Link isn't alone fighting this global threat qnd literally nothing happens outside his own actions. (Even though they still often wait for you to show up, because video game)