Awesome meditation! I think, after Knightmares, any variations in style aren't going to be as far out as Amanda Conner was
. All the artists are doing just stunning work, even ones I don't usually like (mostly Tony Daniel). I don't really see how the Mitch Gerads epilogues were really necessary, but they were really well done.
I agree about Super-Venom. I think that Bruce giving the Memory of the Mountain the drug and the puppet wasn't a problem for me - but I think that Super-Venom, while it's a convenient way to tie Gotham and Gotham Girl to Bane, it makes very little sense in terms of the magical nature of their powers - "life for powers." That has the hallmarks of magic, not semi-science-fiction like Venom, because of the moral quality of it. But eh.
Alfred's sacrifice and the message Bruce received from Alfred/Thomas are where I really see editorial interference. Because it really, really feels like Alfred's death is a cheat, meant to be retconned relatively soon. There are SO MANY WAYS King sets up for it. The Nain Pit. Clayface. All the mind manipulation from Psycho Pirate or even Scarecrow. And it just feels like a broken bit, because Alfred doesn't play a big enough part in the story preceding to make his death work, even though, as you say, issue #83 is heartbreaking and brilliantly well done. But it's too late in the run to really make the death connect beyond that issue and in #85.
And I completely agree that the good surpasses the bad. Particularly since the message of this run is: Batman can grow. Batman can find joy, even while doing everything he can to save people from the dark. It's the opposite of the last two runs - Snyder, who believes that Batman is an impossible, beautiful, tragic dream, who can never be real because he can never be that dedicated to the mission, so if you write him, he can never find true love. Morrison, who believes that Batman is one of the most exciting children's fantasies, but cannot hold up against real evil, and has to be rescued by a counter-evil who murders his biggest threat, after Batman himself has lost everything dearest to him (his son, his city, his ability to save the world, his love for Talia). King stands at the end of 85 issues and says, "Maybe he can get back up again." And it's not breaking the legend, because the idea that Batman can rise again after falling has been central to the myth for a long, long time.
And the message that we should look for a good life, not a good death - I think that's always going to be worthwhile.