Its far more complex then that
This simply isn't true. Exchanges are centralized and can decide on their own who to follow. It's likely in a clean split scenario they would allow both if both are reputable.
Also youre dismissing the fact of what Steemit.inc said, what was agreed upon etc.
You're right, but it's not relevant to my points, which I wanted to focus on. Plenty of squabbling about who said what, so I didn't want to focus on that in this post. And as you mention, our values differ in the first place.