Here's some closed-course manipulation with arms: https://www.youtube.com/watch?v=vuG-qNgLHws https://www.youtube.com/watch?v=vuG-qNgLHws There are others. Con

Here's some closed-course manipulation with arms: https://www.youtube.com/watch?v=vuG-qNgLHws https://www.youtube.com/watch?v=vuG-qNgLHws There are others. Controls is hard! You need investment and to solve difficult engineering problems. But we have a pretty good idea that those things are solveable and can demonstrate success b/c they are engineering challenges, not things we fundamentally don't have an approach for yet.