The big question is will there be that multi-second freeze as you fly into view of the airport as it loads like all the previous scenery you have? Always seems like my sim is about to CTD when it happens.
That so called "freeze", at least under a 32 bit sim, is what instead could have SAVED your from an OOM CTD, something that another scenery purely based on .BGL might not do, because you were sure that until before that moment basically NOTHING of our scenery was taking away precious memory. It's a very well known fact that memory taken by sceneries are not always reclaimed, which is why lots of users used scenery management utilities to configure the sim to activate only the sceneries required for their trip, to prevent unrelated scenery to take away resources, but this wasn't required with FSDT sceneries "thanks" our custom memory management.
Now, under 64 bit we can be a bit more relaxed, possibly loading the scenery way more in advance, doing it slowly over time, so you won't really notice it. The interesting thing, again thanks to our software, is that we can tweak it as much as we like, without this ever affecting the scenery design process, because it's just some parameters to tweak in the software, like how much in advance load the scenery, how many object to create in any given time interval, etc.
Of course, that's only possible because we are in 64 bit. Before, it wasn't really possible to SLOWLY start loading a scenery from 60 NM, and taking several minutes, in the background, to complete it, because it WOULD OOM. Because this is basically what the default method of loading .BGLs works, and developers have no control over it so, in 32 bit, it was either create less detailed scenery, or risk OOMs.
So yes, I think we can now achieve a better loading process.
And, lots more of the scenery WILL be made in (fully P3D4 native) .BGL format, because thanks to LUA scripting, it's possible to make things like multiseasonal textures or multi-layered ground polygons without having to use Simobjects, so the loading process we'll have to manage from the software will definitely be shorter.