The only thing happening here is the handle, and for any non-Tesla manufacturer to adopt the Tesla connector is some minor engineering changes to the on-board charger so the AC and DC inputs share the same pins. Software-wise, NACS uses the CCS protocol because Europe passed a law mandating that Tesla use CCS. Since they were being forced to use the CCS protocol anyway, they started using in in vehicles made in N. America too; this is why Teslas made before May 2019 can't use the CCS adapter... older Teslas used their own protocols and aren't compatible.
I point that out, because the arguments in favor of NACS falls roughly into three categories:
1) The Supercharger network is more built out and generally more robust than the CCS network in N. America. This is true, and regardless of which way it goes having all vehicles use the same connector and protocol means any charger can be used with a simple, relatively inexpensive adapter. Even existing CCS vehicles can, on the newer Superchargers that support CCS under the hood, get by with just an adapter (Magic Dock was the proof of concept for that). Older Superchargers do not have the hardware support for CCS so those won't be available to non-Tesla vehicles.
2) The NACS connector is "more elegant" - also true, though much of that benefit is in the cable which is tragically undersized for the power Tesla puts through them even now, so it remains to be seen how this holds up once they make the cables longer and try to push the 350A that CCS is already capable of. (Tesla's cables are, per their own documentation, only rated for 200A continuous...)
3) Tesla superchargers are more reliable and have a better used experience than CCS chargers. This is true, but it is not necessarily the case that this means non-CCS vehicles using Superchargers will get the same level of reliability. Virtually all of the CCS issues are software related, and the majority are issues with how every manufacturer of both vehicles and chargers have wide discretion with how the CSS protocols are implemented. Unless someone is overseeing the development of non-Tesla equipment, there is no guarantee that you'll see any improvement in the user experience. If the software ain't right, it's basically all for nothing.
There are also further hurdles to get over before everyone gets to excited; The lack of standardized charge port location and super short cables (necessarily short - they are undersized after all so need to be as short as possible) will need to be worked out. The lack of payment options at Supercharger sites also needs to be resolved as a matter of law in some areas, if not general convenience. Having third-party manufacturers get involved means quality will be just as varied as it is now, too, so I don't have high hopes that situation will improve any time soon either.
Overall opinion: meh/10 it's still going to be a mess.