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For starters...
>I liked the really alien weirdness of the planes. Plus, alignment had a much larger purpose within the planes, rather than just some roleplaying tool.
>I'd introduce different factions, a mixture of classical ideals as well as modern for the current age. Of course, these couldn't be too tongue-in-cheek or too obvious, lest you get bad political satire.
>I think it does, it's just not spelled out a lot of the time. Floating Dead Gods could be treated as one. Likewise, demiplanes can be serviceable. Also, while not fleshed out in one source, Undersigil could have been realized as a great alternative for when parties need a break from the politics.
>I'm find with linking to various primes, but I wasn't all that into the execution, especially with Greyhawk. While it got hastily put in and quickly taken out, it would have been cool to flesh it out for Mystara. Serraine sounds perfect for it, honestly. Of course, the Immortals hate extraplanar outsiders. So, that might be a problem.
>I don't see why not, different means of travel.
>1E felt more alien to me. But, I'm fine with Planescape.
>I wouldn't know how to use it, so I've always ignored it.
>I added Mystara's Limbo and the later FR Fugue Plane into a Dimension of Death, akin to Pathfinder's Boneyard Plane. It connects to the Outlands.