How would changing the bridge design be a major discrepancy, we're talking about the original Enterprise in the year 2233 not 2264. Remember the bridge in 1979 wasn't an exact copy from 1967 and the Cage bridge was different from the regular series bridge. Heck they could probably alter the design of the ship and get away with it by saying the TOS design was after a refit.
I wish there were a rule that the rules of Canon would apply only to events, not to design. Elements of design are too unavoidably linked to the era in which they are crafted—it would be such a relief if fans would appreciate these elements without demanding that they be set in stone for Ever and Ever, amen.
For the record, I would have loved to see that opening.
