Sure, relative. The artistic intent is to show some ships called Enterprise, and that D is bigger than C, which is bigger than B, etc.
Bingo.
it wasn't broken when they later invented the NX-01, and it's not broken when SNW
Again, I'm not claiming there isn't a retcon - obviously there is, but there always have been.
This is true. There will always be retcons just as surely as there will always be things left out. Even single authors -- with editors backing them and fans pestering them -- forget details, or decide to include something without working out the impact, et cetera. Meanwhile, by the end of the Berman era, it was forty years of various productions, each the work of many, many hands. The fact any of it hung together at all was remarkable, the fact it meshes rather well a miracle, but it was also no accident. The willingness to discard that effort and the continuity it resulted in, a continuity that brought so many so much deeper into Trek in the first place, is just . . . ugh.
I get that for many fans this is a retcon too far, because there was a 50-yeat cottage industry of fans writing books and websites all around the TOS Enterprise being 289m.
That's exactly why some rescalers like to do what they do. It's the same elitist secret-knowledge thrill folks get with conspiracy theories ... generating them or buying into them. "289 meters? That's just what
they want you to believe! I know better than the little minds who can't get past that!"
For most folks, noticing that a set piece or matte painting doesn't match the model is just an error, either a typical Hollywood mistake (just as might occur when a sitcom house interior doesn't match the exterior establishing shot) or perhaps an intentional cost-saving (like Michelson's Follies regarding the Rec Deck), or just something to ease production (like a standing height TOS shuttle interior).
For rescalers, however, it's evidence that shuttle fuel can't melt duranium beams . . . but when pressed over the inconsistencies that line of thinking would bring, it's suddenly all "James R. Kirk! TMP Klingons!", et cetera. But if everything is a YATI, why not their evidence, real or imagined? Why must consistency itself be attacked? (That, too, is not dissimilar to conspiracist argument.)
Where folks have found genuine, significant errors, congrats . . . but even then, there are fewer of those than claimed.