Native Access does seem to be a potential improvement over Service Center, although it's barely out of beta and is not as full-featured as its predecessor.
You cannot, for example, update third-party libraries, and even some NI products are not yet supported.
There is still no offline option, so you must have your DAW connected to the internet. That can be a problem, because you cannot just disable and re-enable your NIC as needed without screwing up many products' authorizations. NA will not run on XP, so XP users (yes, there are many) have to continue using SC (and it's currently broken).
Service Center also provided a link to release notes, which Native Access has yet to implement. I liked the fact that NI bucked the general trend of hiding release notes as so many other vendors do. But there does not seem to be any publicly-accessible change log for NA, so we have no idea what this update is for. Maybe it's OCD, but I like to know that stuff.