I agree with most of the list, some items more than others, and don't have anything new to add. Thanks @Studs for keeping up with this post over the months.
I must be missing something because as far as I can tell all it does is gives us a chance to double check the math, which will result in a bunch of (unlikely unnecessary) support tickets. Maybe some players complain about RNGesus not blessing one of their kingdoms. I apologize if this comes off as rude, not my intent, I'm genuinely curious what the benefit is.
I see the benefit to some players, but as others have mentioned it maybe off-putting to a great deal more. At level 400, I'm scared of the ~900,000 souls I need for my measly 240 troops. Not disagreeing with the feature, just voicing my opinion that it should probably be left just to our individual progress tracking spreadsheets.
Unless I misunderstand, this is implemented on mobile. Not sure about the other platforms.
You're purchasing keys with your seals. Not unlike gold and glory keys being bought with their currency. The keys themselves can be bought in the guild tab shop. While an auto currency-to-key converter would be nice now, it would close the door on using seals to purchase other things. As it stands the other currencies (gold, glory, and gems) can all be used multiple ways.