This build includes more bug fixes and under the hood changes, as we're in the last week or so of development on the Fall Creators Update. (windowscentral.com)
Add this together with more bug fixes than we have time to mention, and you're looking at a healthy update. (androidcentral.com)
However, carriers often hold out on getting more recent versions of software, which contain more bug fixes and additional features. (ibtimes.com)