The government needs to employ lots of people. This necessarily means they will employ some low-quality people. It's such a difficult problem to produce high-quality work with low-quality employees that most tech companies of scale have optimized their hiring process to pass as few low-quality workers as possible at the cost of turning down many potentially good ones. It'd be nice to see some effort to make working with high quality-variance employees successful, but I think the reason we haven't seen much of a convincing, scalable answer yet is simply because it's a really hard problem.