Are there any dumb USB-C to USB-C cables available? Simple 24 to 24 pin cable
I am not sure about electronics inside the Type-C cable overmolds. Cables with electronics markers on CC lines are pretty hard to find yet.

However, no standard C-C cable has all 24 wires. At least the USB 2.0 D+/D- wires have only one pair of them across the cable, see this assembly table from Type-C specifications,



So, the standard C-C cables have at most 22 wires.

More, if someone wants to use the Type-C connector as a nice generic 24-pin connector for arbitrary set of signals, they would need to make their own cable assembly. The reason is that standard USB cables have 5 pairs of cable wires tightly coupled/twisted to form differential pair, and can't be used for individual signals due to horrible cross-talk.

ADDITION: I'll take it a bit back. Per USB Type-C specification, ALL full-featured C-C cables are required to have eMarkers in overmolds, regardless if it is 3-A rating, or 5-A rating. So the only full-featured cables without eMarkers would be illegal, uncertifiable cables.