If I had a nickel for every person who had asked me for the ability to edit comments, I may not be independently wealthy, but I would have a nice vacation fund.
The reasons for not offering editable comments on SB Nation's sites were essentially that we didn’t want trolls and other lunatics going back after they made an inflammatory remark and changing them. Also, it’s only fair that when you make a comment, you should defend it, not go back and alter it so that it looks like you are being unfairly attacked.
Those are good reasons, but it is also true that all of us sometimes inadvertently type incomprehensible gibberish that made sense to us, but comes out completely wrong when read. That and typographical errors are the biggest reason for the desire for editable comments. That wish has now been granted by the code genies at SB Nation and Vox Media.
It is also true that web development technologies have made this more possible now than before, just as all these fancy effects we now take for granted were impossible only a couple of years ago.
Here is the Blog Huddle post on this new feature, which should be live now on all SB Nation sites, as well as The Verge and Polygon. There are some caveats and limitations, which you can read about there. I hope you enjoy it.