Active sticks have been in development for decades. They’re getting deployed on civilian crafts these days e.g. Gulf Stream’s top of the lines jets (though retr

Active sticks have been in development for decades. They’re getting deployed on civilian crafts these days e.g. Gulf Stream’s top of the lines jets (though retrofitting them on existing planes is likely a ways away still). I would assume the issues are / were around reliability, failure modes, certification and training rather than patents.