That's the most conservative interpretation of Chesterton's Fence I have ever seen. Each rule is critical because it is included in a set of rules which are intended to help, and removing any means breaking the whole fence?
I guess you could get even more conservative and assume that the absence of a law is also intentional and we should maintain the status quo forever. I'd argue that even that would be preferable to a system where you can only add restrictions.
That's not quite what I'm pointing at here, and I also agree with the other commenter that the metaphor is stretched too far to be useful.
But if we're going to stick with it, it's very likely the fence will still work for its purpose if you remove some of the pickets. But to figure out which ones, and how many, you need to have a clear conception of the fencemaker's goal and how it currently accomplishes them or fails to. The significance of any specific part isn't a sound basis for an argument about the purpose or usefulness of the fence per se.
Do we have any indication that TXSE is arguing against the purpose or usefulness of the fence, or that they won't make thoughtful decisions about which pickets to remove? This article just calls the diversity rules, which have (afaict) no bearing on the integrity of the market.
But, for context, all I was trying to do when I accidentally started this whole side tangent was suggest that unbounded speculation that isn't tied to concrete, specific things is unlikely to be fruitful.
As far as I can tell, the only specific thing that's been mentioned is not having an equivalent to NASDAQ's board diversity rule. Which doesn't seem like a _huge_ differentiator given that NYSE doesn't have one either?
TBH though my first instinct is to say that I doubt their rules will be egregious, and in a market as large as the USA having a third national stock exchange probably wouldn't be a terrible thing. Markets generally benefit from healthy competition, even when some of the individual competitors aren't everybody's favorite.
I guess you could get even more conservative and assume that the absence of a law is also intentional and we should maintain the status quo forever. I'd argue that even that would be preferable to a system where you can only add restrictions.