Agreed. It would have made much more sense to make the initial 6th generation fighter a twin engine large aircraft to replace the F-15 and F-22. To find the budget to develop it the program should be a joint effort between the USAF and US Navy. As for the F-35 cost that could be mitigated with a program to reduce costs to manufacture and maintain the aircraft. Instead of developing a whole new 6th generation aircraft which will likely end up not being any cheaper.