If I understand your question correctly, I think you may be missing that it can lock the wheels so they don’t roll sometimes like when it’s climbing uphill.

Here -and with every product promo video - you are watching curated shots. Non-flattering footage simply will get deleted during edit, except perhaps for the blooper-reel, if that's the company coldly calculates to present a goofy, non-threatening vibe.

It doesn't have perfect traction. It stumbles in the videos. This is consistent with other wheeled robots that have come out the last few years.