Well that was a long read. I feel certain that the 6 episodes could have been covered in a film just fine and that the essay could have been 12 or so thousand words shorter! Fantasy writers are known for always wanting to be more epic than the last one I guess.
My verdict is that I will be very annoyed if the entire series was set up to be rubbish so that they can pull a Metatron interference twist. Millions of people had to sit through the crap hours and if it isn't well received enough they won't even get to make the third series and prove how clever they all are! Unlike the writer, I don't think Neil Gaiman is a God. Didn't enjoy Sandman and his interference killed off American gods before we got to see the end. Particularly annoyed that technical boy didn't get his arc finished.
I rather hope that the ones pulling the trick are Aziraphale and Crowley themselves. The "getting closer" was never explained, so might not have been meant to happen on series 2. They do want to live on Earth, so maybe need to get Aziraphale into heaven to stop the second coming being the next apocalypse. The smile in the lift was joy that they succeeded.