I hear what you're saying, and I think semantics may be dragging us down. In a jazz setting, you can make a distinction between "correct" changes and "accepted" changes. I was approaching this issue more from the practical side rather than an academic side. The accepted changes of many, many standards, as you know, are not the ones the composer wrote.
There is also a difference between thoughtful, deliberate reharmonization and downright WRONG changes. The first (bootleg) editions of the Real Book were plagued with errors, and because they were in the Real Book, they ended up being perpetuated.
"Round Midnight" is a special case, because in addition to the common existing variations, the first version of the Real Book contained some bizarre changes that I'd never heard on a record either before or since.
In live playing situations I've been involved in, I'd say it's about 50/50 in terms of how those last two bars of the bridge are played. I thought in the context of the discussion that that was worth mentioning.
And if one of my tunes is reharmonized and accepted that way, so be it.