I'm not so much of a purist that I'm opposed to replacing shots or effects as new technology emerges.
At the risk of starting a flame-war, I actually liked some
of the changes made to Star Wars in '97: (I think the "Greedo shooting first" bit is nonsense as much as anyone, but I did like the updated X-Wing shots; the celebrations on Bespin, Tatooine, and Coruscant; and replacing that silly "Yub Nub" song at the end with something a bit more serious)
Similarly, I was fine with what I saw changed in TOS-remastered. It's probably best, for instance, that the Woden doesn't look like the Botany Bay, and it's hard to defend not fixing the size discrepancy in "The Doomsday Machine".
I'm just curious to see what they might've done had a bit more time and money been available.