This has given the social network a better and more feedback access by a lot of many users that are mostly on the mobile web-based version of the social network and hence, having a lot more users on the Instagram web-based version.
Instagram wants every user to have access to its stories feature thereby making it available to the Mobile web, and this gives the web-based version a very nice and clean view.
Now, this has made it an Amazing great improvement from Instagram; as this will give most of its mobile site users to access the feature of story uploading right from the comfort of their mobile web browsers.