All of the above.

A 600g alloy rim seems excessive. Honestly, I think it's just mediocre extrusion but hey, that's just shade.

At that size of rim, carbon kicks alloy's arse. There's just no point.

The doodle I posted would seem more gravel specific. I think 23mm IN WIDTH is far beyond what's practical for road. I think 19-20 IN WIDTH is about the limit for 25c - 28c road tires.

What say you all?