this is also a wanring to young people joinging old companies in weak job positions over taking a chance on a new company trying to be better. dont just assume the old company is going to be there forever.
especially now in defense. war has changed. companies like Anduril are on the rise while classics like Boeing, Lockheed, Raytheon, etc are assessing how much they can adapt. its not extreme like theyll go out of business but the gov may order way less jets and such than in the past, and put a lot more money into drones. they will still buy jets though, and the classics may need to adapt to a lower funding pool, lower orders, and becoming a low volume legacy product hovering around certain use-cases, while new companies get all the runway to takeoff on the big investments.
this kind of thing plays out at all different scales and to different degrees everywhere in the market.