As apps, online tools, websites or other products gain popularity and become more used, it is important for the product owner to evaluate and refine based on user feedback.
What was thought to be a good idea on the whiteboard during initial development can sometimes reveal itself to be a little less than perfect when used in real life. Google has been discovering that with their Google+ product.
In the coming months, Google will be shuffling features around to create a more focused experience, moving some out of Google+. Additionally, Google will allow users to use apps without logging into a Google+ profile.
To learn more and stay up to date on these changes, read this post from Google