I assume the only benefit of a 1 piece hub & spoke system vs hub & spokes is weight, right? But how much weight saving are we talking? It's bound to cost more, and warranty shenanigans between China & the west tends to be a mess, with shipping costing a lot & taking a long time.

Weight and stiffness, and for somebody, the aesthetics. But for me, the eventual hassle with repairs is not worth it.

Joe said rim brake will be available later so they are not the same shifters

My source sent me this photo that Magene told him about the shifter disc + rim compatibility. But I honestly have no idea how it works.

I understand, but the price for delivery to EU is probably way to high with additional customs and taxes included.

AX gives us the chance to send the wheels past this extra costs.

I have read your review about the Edge wheels and if you could explain a little bit more about the stiffness... I am in no way a pro rider but really love it so I upgraded my wheels to these form the stock ones. I am more of an uphill rider so what the stiffness mean to rides like this.

The problem with explaining stiffness is how abstract it is. But I will do my best. With very stiff wheels (usually those with carbon spokes), you get the feeling when pedaling that the bike is immediately moving forward and reacting quickly. On the other hand, on rough roads, most of the vibration is transmitted to the bike frame and seat, which can lead to fatigue (as your body gets constant "hits").
Softer wheels (usually steel-spoked ones) offer higher ride comfort (because the vibrations are absorbed by the wheels and are not further transferred to the frame to such a high degree). But they don't have the same feeling that you're going immediately forward. Anyway, if these are your first carbon wheels, you probably won't notice anything like that. Personally, I only started noticing these differences when I side-by-side tested multiple pairs of wheels.
Maybe one more thing: The heavier you are, the more you will probably notice the differences, especially when riding out of the saddle and sprinting. I weigh ~68 kg.

I've tested EDGE, ENT, and DRIVE wheels. The ENT and EDGE differ mainly in weight, spokes, and rim profiles. I am not sure about the SLT and SLR. I will consider writing a comparison article about all these wheelsets. Anyway, the DRIVE wheels have carbon spokes and ceramic bearings.
Regarding ride feel, EDGE + ENT are pretty soft but comfortable. But for example, I didn't feel like riding 1350g wheels when riding EDGE. They are not as responsive as DRIVE ones, which are a bit lighter. The ENTs are much heavier and better for flats and steady efforts.
Having said that, I would recommend saving a bit more for DRIVE wheels. They are my go-to climbing wheels (45mm depth weighs under 1300g), and they are much more responsive than EDGE.
However, it also depends on your experience. For example, I would be happy if I was transitioning from ALU wheels to EDGE. But given that I've tried wheels costing over $1000 with carbon spokes, I'd opt for those instead.
Feel free to visit my website where you learn more details on these wheels.