I remember consistancy being a problem as far back as TNG but saying TOS is inconsistant with itself is irrelevant besides it wasn't.
I made a brief list a few pages ago. The original series contradicts itself and changes premises. Fact. You can rationalize it all you want, but if TOS can fit into the same continuity, then ENT, TAS, TNG, DS9 and STXI's Old Spock and timeline divergence point can all be part of one huge one.
You can't ignore the mistakes in TOS but not similar ones in STXI, reguardless of whether you thought the film was any good or not.