Here some 2 videos about unboxing and mounting of the Lexon cranks.
https://youtu.be/stbtV1tjf_w?si=Pc6FapEohYvWQCEv
https://youtu.be/8IENg6XRPVs?si=dHmCubrQ4ZrJ5NN4

Done now around 500km, cranks are doing fine.

Next project is to improve the chain line which is currently quite to the right (outside) as all spacers are on the right.
Just order some alu headset spacers (28.6mm inner diameter) and will use them together with a 24mm spacer (28.7mm outside diameter).

just now I found these here, should be an easier fit of a perceived (mental) issue of chain line perfection.
https://www.aliexpress.com/item/3256807897752807.html?spm=a2g0o.productlist.main.29.5efc504fMEPjcr&algo_pvid=b27c04b1-64ae-4fd9-9803-775cba6f70ed&algo_exp_id=b27c04b1-64ae-4fd9-9803-775cba6f70ed-14&pdp_npi=4%40dis%21USD%213.30%211.91%21%21%2123.73%2113.76%21%402102f0c917315467680074286ef473%2112000043613694070%21sea%21US%210%21ABX&curPageLogUid=mw48wf1ig8Ux&utparam-url=scene%3Asearch%7Cquery_from%3A

So far so good, have done 10 rides ISH and going for a bigger 160km round today, Onyu pass in Japan.
The cranks are holding up very well only the Powermeter was/is a bit off compared to me wahoo kickr. Like 30 watts, which is not that insignificant as I'm not enjoying Pogi's power output

Managed to mount the crankset!
Figured that the right side needed much more spacers to create clearance between the lockring and the bottom bracket outer shell.
Once this was done the adjustment ring on the left was sufficient to close the gap and avoid play. The ring sits barely on the inner BB seal, which should be fine.
Lexon staff agreed to put spacers in future deliveries. Some installation instructions would be helpful as well....
Below the new and the old cranks on my Sculptura 9000.
Haven't rode it yet but should be happening later this week.

tried installing the crank yesterday and had mixed experience...

1. the power-meter installation went smooth thanks to the help of the LBS that had right lock ring tool (used for bottom brackets as well)
2. mounting the axel into the left crank arm, no problems. good fit and some wired white paste was already available. still added some grease for good measures
3. mounting the cranks to frame: well this was not going too smooth....
- no spacers where included --> used the spacers from
- the adjustment ring from the left crank arm has an inner diameter of 29mm, this is too big for the spacers which are 28mm OD...
hence all spacers must go on the right side, which is not good for symmetry and might increase the flex (if there is any with my spider legs) ass the right side sticks out more
- the adjustment ring has also a rather short rang compared to the older XCADEY version
- added both spacers on the right side and still have larger gap even with the adjustment ring fully out...
==> not really that well ridable
Now I ordered some more 24mm spacers from Amazon, should arrive today and use this temporarily.
My idea is to use an aluminum head-set spacer (ID 28.6mm, OD33.5mm) to put it on a 24mm crank spacer (OD 28.7mm) via hot/cold shrink or sandpaper followed by GLUE. does anybody has experience with it?

You are right that having a larger diameter makes the tube stiffer with the same amount of materials. That is one of the reasons why aluminium frames had rather fat tubes.
In fairness to Lexon, all titanium 24mm spindles had this design (flaw) because the milling of the inside of a tube is rather costly compared to the outside milling. (Guessing that the Elilee crank has been milled on the inside)

The postman stopped by

I'm using the Xcadey crank in 172.5mm with titanium spindle since ~3 years and so far it is holding up fine.
the Xcadey Gen1 powermeter does not....

About me: ~80kG, 6~8000km per year, road only with loads of climbing in Japan, no races, sprints 1200W peak during Sunday group rides

From my subjective view, the 24mm version adds quite some weight to the Lexon carbon crank vs the DUB version, this is not the case for the Elilee, not sure if the titanium axle is having thinner walls or not. ==> it is not only the material but also about the detail spec (aka titanium grade), the shape as well as average wall thickness, besides others...
That being said, I have not yet seen a single broken titanium axle, not so sure about aluminum ones

It seems that Magene is rather quick when presenting new parts on bike shows. In 2023 the pedals where displayed in China and even some carbon cranks that have still to surface on the market.
For the customer it is obviously better to finish a product instead of releasing prototypes with many flaws to public. It is nevertheless a bit disappointing to see Magene (together with many others) to create expectations and then keeps everyone waiting.