Was there a problem with spcycle previously?

There are several posts of peeps reporting broken suspension arm as well as cracked frames if you google the keywords.
They are claiming to adress those issues with the M868 launch, but since there are also several posts in this forum about other SPcycle frame quality issues, i'm probably going to either skip buying it or wait until others confirming that quality issues have really been solved.
The second problem with them - according to few posts also in this forum, is not honoring their warranty. A couple of buyers left with a broken frame and no replacement in sight.
Either way, SPcycle not doing too good lately with all this bad publishity.

I am also 179.5cm and I was about to order an M size. According to them, it should be my size. Now I am confused.
Also, it looks like 2.2 wide tires would not fit. I guess I will have to do a hardtail gravel bike afterall.

There aren't too many 130-150mm rear travel chinese frames out there. Some chinese manufacturers don't even have one to offer. The SPCycle and Airwolf ones however are both UDH.

Really? Pretty much all frames are UDH now.
A few here:
https://www.sp-cycle.com/Carbon-Full-Suspension-Frame-c57264/
or here:
https://airwolfcarbonbike.com/product-category/mountain-frame/suspension-frame/?orderby=date

For me too, and I suppose for many. The cable routing itself is not a problem for me, but I race, so I want the cockpit as low as possible with a fork of 120mm travel. A completely internal routing is the opposite of that idea. Besides, I am a fan of mechanical gear changes and sharp cable turns will not work here

Same here. Cables through the headset is a bad design trend that needs to go away. It has no real benefits, is annoying to service and can lead to problems.