So do I.

Sure the visuals of David's face from the first season raid on Division 3's other building were horrifying, but she knew that at the time he was under Lenny/Farouk's thrall.

See, that was one part I did not have a problem with because Farouk very cleverly defused this argument - when Syd herself raised it - with his "yes, you can force people to kill, but there is no power in the world able to force them to enjoy it" reply. Now whether or not David enjoyed it is up to debate - personally, I had the impression he didn't and was horrified post fact - but he certainly looked like he was enjoying it, plus this is coupled with him simultanously torturing Oliver with smiles and sneers and confessing he's scared of how much he enjoys imagining the various ways to kill Farouk.

Incidentally, I thought the earlier episode showing us various different versions of David depending on different choices made the point that he has it in him both to destroy himself rather than harm people and to become an evil overlord who cares about no one. The big mistake Sydney makes in this finale, imo, is to assume it's already decided which way he'll go, and that there are only two alternatives (i.e. Evil Overlord David, or Dead Or At Best Imprisoned David).

And so far as I knew, David's torturing Oliver was done on the astral plane rather than in physical reality.

No, I think it was physical, because when Cary arrives he sees Oliver's bloody face and David says Oliver should be dead but isn't. Now whether David hit Oliver in physical reality or whether he tortured him on the astral plane with the pain producing physical results on the real world plane, I don't know. But Oliver is definitely physically in a bruised and comatose state due to David's earlier actions.

When