Thats the sad fact. Watching the docs on the DOS EE its abundantly clear that these films do not have enough Post producrion time. The Smaug scenes in DOS werent even started by WETA until around a month before release. The sound mix guys had to start building the sound mix around the rough animatics. Smaug's design wasnt even finalized until around four months before release. And the sound mix was delivered hours late because they were so far behind they had to work for nearly 48 hours straight to get it wired to LA on time. LA was losing their ****. And the shot of Smaug opening his eye in AUJ was finished on November 25, 2012. The day of delivery. Jackson says "Well I guess I have to approve the shot cause there is no other choice." Stuff like this was the norm during the post-production.
Its impossible to make films like this look flawless with that short of a post production time. Frankly its truly amazing they look half as good as they do. I think most crews would completely collapse under the sort of pressure that Weta and Jacksons whole crew are put under in Post.