Me too. Sure, software doesn’t require big infrastructure but it does require large development teams of very talented people that have to integrate all sorts of stuff plus new stuff. Then there is new airframe technologies (design and material), then engines, then EW, comm links, etc. etc. Multiple companies in the US developing several platforms at the same...hell the entire worldwide military aerospace industry has only produced 4 5th Gen jets in the last 20 years, two of them in the US. How truly 5th Gen the Su-57 and J-20 are is debatable. Don’t know enough about the J-31, perhaps it could a candidate as well.