My guess is that FSL is like a lot of these developers where it’s just a shop of one to three programmers with an idea and vision who manage a bunch of contractors and do most of the work on their own. The first plane is a labor of love and commitment. After that growing into a real business that can find a sustainable business plan to support growth or to level up is a coin toss. FSL probably got close to moving up bc of their success but never pushed to actually grow and likely mismanaged it. Eventually they regress back to three or four core programmers who finished out the Concorde but no real desire or acumen to manage growth so you get these slow two people not even full time development updates over years.