This seems a bit concerning. Is anyone else seeing something similar?

I've got about 2000km on my ER9, only some scrapes on the FD guide.
Maybe the limit position is incorrectly set on OP's setup? Or he isn't hitting the trim button every couple of shifts?

Unfortunately it seem they are sticking with the triangular downtube on the agile, while doing it better on bike #2

Could you enlighten me on why Triangle downtubes are seen as bad design these days?

Is it related to frame stiffness or how airflow interacts with bidons??

I have a Rockbros RHL1000

excellent battery life, bit on the heavier side but gives as much illumination as you'll ever need.

Do you have access to an extended 5mm hex key?

Definitely worth the investment just for doing up shifter bolts.

Another masochist eR9 beta tester chiming in:

As with the user above I also had sub-optimal interactions with their customers service, with typically 1 business day gaps in the reply time, so getting a replacement part which I had damaged took a total of 5 days to be dispatched.

Regarding the shifting performance, it's quite good. A few rides so far and no missed shifts or issues with the groupset not waking up.
Shifting under load up to 200w is crisp and the app integration is very good. Being able to adjust each cassette and chainring offset through the app is fantastic for setup, during my first ride I was able to whip the phone out and fine tune the trim whilst riding.
Regarding the trim function, I'm not sure if it is a result of the latest update but you can now trim in both directions (however) the trim direction is not controlled by the user. Essentially whenever you hear front chain rub, pressing shift again will trim the FD if the system determines it needs trimming, and there seems to be several steps. I.e if I shift from the 11th cog to 9th there is a trim step, then 9th to 3rd it will trim again, then the same the other direction.

Install wise it was easy, not having to run gear shift cables saves some grey hairs especially if you're fully integrated. The YouTuber Klein concept has a solid 90min install video which walks through all the steps.

I've ran some 3d printed stem spacers on my bike for ~1000km after I built it up until the white color irked me enough to order some cheap carbon ones.

It was printed out of 100% PLA, didn't have any issues with creep in that time.
Since the load is compressive and fairly low, there will be hardly any creep especially if you print it 100% infill.

That being said, use PETG or something that won't deform in the heat

I DM'd the Aliexpress store rep and they weighed two sets for me.
1510g for eR9
1500g for eRX

note he has all the packaging and cables on the scale + caveats about scale calibration.

Interestingly this would mean that the price difference between eR9 and eRX is essentially a CarbonFiber tax.