Do you have any idea how much time and money it would take to even figure out how much time and money it would take to buy a robot and get it to do what you want it to do? I don't, because I don't have that kind of time or money, and unless you're at a major research institution, taxpayer-funded government agency, or multinational corporation, you probably don't either. The reality of robotics may be expensive and messy, but in simulation, everything is fast(ish) and easy(ish) and comes with both "reset" and "undo" buttons that don't cost anything to push. One of the best robotics simulators named after a polygonal garden structure just got a major update that adds a bunch of new features and makes it even more user friendly. Friendly Graphical Model Editor: Instead of trying to get your robot model into Gazebo by typing in numbers and stuff into an XML file, you can now use a graphical ("normal person") system instead.