I've used elementary OS before, but I wasn't really interested in creating an account here.
I was browsing the new questions out of curiosity, and tried to edit typos out of the title of a question, but found that I was not able to do so without creating an account. This is not generally necessary on any site in the network, whether one is logged into a Stack Exchange account or not, there is always the "improve this question" button below the post.
On the posts on this site, when you are not logged in to an elementary OS SE account (whether you have one or not), there is no "improve this question" button underneath a post. (I'd post pictures, but Imgur is giving me trouble today). This can be tested in incognito mode.
If it makes a difference, I viewed the question originally in Chrome 56 on Windows 10. (no updates available for either)