Many of my engineering friends happen to work in defense (I'm friends with a lot of aerospace engineers from college) and are now highly specialized engineers on stable and long term projects and happen to be at the forefront of innovation in that space and all have high level security clearances (for some of them I don't really know what they do since it's classified). Though it also could be they just have gotten lucky. My friends I made from hobbies work random and less highly technical jobs and I know a decent amount of people "in between jobs" right now. It's all anecdotal but there's a clear enough pattern that if the chair of the Fed also thinks we're underestimating I think it's very likely we are.