Agreed. Device-wise, it's a busy time for Sprint with iPhone Forever, and Sprint has been getting positive press for going all-in on iPhone 6s/6s Plus with a great offer/plan. However, as far as the network is concerned, it seems like we've entered a "quiet period" where it doesn't seem like much is happening on the surface.
Perhaps there's a lot going on behind the scenes we can't see (Project Ocean/Project Cedar, etc.), but as you said, these RootMetrics scores would hopefully show CA deployments or NGN progress.