No, it’s like ordering a car for $40K, then going back to the dealer over and over again with new specs and complaining that it costs $5K more than you were told when it finally rolls off the line.
THAT sounds more correct. Happened way too many times with F35, it seems.
Though in some cases it did seem the final product was flawed in some way and government paid to fix flaw.
but you are right in majority of cases.