Revisionism is becoming a complete norm - I've just been watching the Hobbit TDoS EE BD extras and they said that in the DVD and BD release of the first Hobbit, they re-did some shots of Smaug in the prologue to match the TDoS version of him.

And to comment on topic - and I said this countless times before - in a case of a semi-special edition, who will decide what's still ok and what isn't - for someone the line could be drawn at matte-lines, to someone else it may be the windows in Cloud City and to yet another person a digital Dewback may be preferable to a stiff rubber figurine. Whereas for a restoration with the clear goal of trying to get as close to the way the movie looked on opening day, the path is perfectly clear and isn't really up for debate.