I don't accept Enterprise as a prequel to Star Trek.
The more I read these threads on canon, Enterprise vs. TOS et al the more I start to think that Enterprise was meant to be a prequel to and later shows sequels to the TOS
movie era. I mean when people say Enterprise doesn't look like a prequel to TOS, well this is true but TOS the TV show doesn't look like a prequel to TMP-TUC. Enterprise, the Movies, TNG etc all flow nicely into each other from a technology / 'look & feel' perspective. It's only the orignal TV show that looks out of place.
But it's really not fair to blame later shows (including Enterprise) for violating certain elements of TOS, when IMO the violations started with the TOS movies. From a practical standpoint (in-universe) it's hard to imagine how technology and such changed so dramatically in only a few short years between the TV show and TMP. I know the reasons why: the creators felt it needed an update since so much time had passed. But why does TOS itself get a pass here but later shows (esp. Enterprise) get raked over the coals when they didn't begin the process?
In regards to
story continuity I agree that there are some issues with TOS vs everything else, but again, I think the intent (beginning with TMP) was to look at the original TV show as a sort of 'low-res' version of the Trek-verse and going forward they would be showing things as they 'really' were. This includes, for good or ill, some revisions of continuity and events.
I mean TOS is my favorite series, and there is much of later Trek that I dislike (esp. the magic technology) but I hate to see them unfairly blamed for things that were well underway before they existed.
To recap, I think that the revisions to and de-emphasizing of TOS began with The Motion Picture, not later shows. They merely continued a process begun before they were created. And, as much as I love TOS, Ent to TMP-TUC to TNG and beyond all look pretty consistent as an evolution of technology, etc - with some small to medium continuity issues depending on how closely one cares to look at those issues.