Depends on the tech. Aerospace has gotten significantly cheaper due to accurate simulation tools. You can design a supersonic airplane or rocket engine in software and expect the first prototype to at least sort-of work.
The improvement of tools and slowing of silicon process improvement means that a startup can fab a competitive special-purpose CPU. Hennessy and Patterson's Turing lecture has an overview [https://iscaconf.org/isca2018/turing_lecture.html]
Robotics has gotten easier and cheaper thanks to good off-the-shelf sensors and actuators.
And if so , what's the infrastructure behind that ?