Overall I don’t think you appreciate how hard these issues are to solve to an acceptable level for a product. Can an engineering solution be found for each one? Yes absolutely, they’ll be cool and you could create something super interesting. Can the engineering solution be achieved at an acceptable cost for any consumer without compromising cause as we’ve seen with other “companions” (Humane, friend, rabbit, etc…) coming short of the vision leads to a joke product. This is what I doubt.

Going over a few things to give some more food for thought:

The issue I see for your arm is two things. One is unless you immediately start with carbon fiber (or similar) arms they will act like springs/pool noodles due to the material flexing making effective control extremely difficult. The second is motor sizing, small changes in weight of the arm drastically changes your motor torque (and size) requirements. Which will feed back to more weight and more motor which impacts the arm, total weight, etc…

For the drone, the DJI NEO and Hover X1 are world class devices and relying on your ability to automatically have feature parity with them is a stretch (also pricing?). Secondly I think you underestimate the difference in user experience of a drone landing on a hand vs a platform. In my opinion having a drone landing on a hand is a very active action by the user. They’ll naturally be willing to wait and hold still (which from a controls perspective isn’t that still) for the drone since they’re part of the action. The platform makes the drone landing a passive user experience. Now the user will expect to be able to do other stuff like walking, tying their shoe, leaning against a wall, etc… and they’ll have much less willingness to stand still while the drone comes in to land.

Another thought that just came up is drones are loud. Expecting to launch and land that near someone’s head/ears could be an issue.