TeX.SX is not considered to be a forum but people can post questions and answers. Today, and especially in such sites that many people are living a big part of their life online helping other people (or not), each one of such users have an online identity connected with their nickname (and some times with their real identity out there).
People who spend so much time online being active users with posts and comments etc (and not just reading posts or just been logged in), is at least simple logic that they are interested a little bit or more about this online ID.
So, changing many things on a post, is always a risk to make unwanted changes from the original poster. For example a rephrase of a sentence could improve its English grammatically but also could be using such a formal language that the original poster would feel sick about owning that post. (Just an example to make clear how careful we should be on editing and not just reformatting a post).
This is my general opinion and it is not specific to the linked rejected changes.
About the linked rejected changes, on the "language" changes, I already gave a reason above but it is not specific to your post since I already read it three or more times to understand it and try to find if there is an improvement on it (not good enough English -I mean my English-).
So, my final answer is that we should be really careful with changing something more than the format of a post without being absolutely sure that this edit is not just improving the question/answer but is also acceptable by the author.
Personally I would have skipped this edit because of the "language" changes and would have leave it to the others to accept or reject.