But a humanoid isn't the optimal form factor to be able to navigate those kinds of terrain. A quadruped robot like Boston Dynamic's Spot is much more stable tha

But a humanoid isn't the optimal form factor to be able to navigate those kinds of terrain. A quadruped robot like Boston Dynamic's Spot is much more stable than a bipedal one, and is already being used for those sorts of applications. For rougher types of terrain, hexapod robots do great (not the spider-type ones - ones with three legs either side, that fully rotate in the vertical plane), or for that matter just use a tracked tank-type design.