"By law, state plans are transparent about their fees and operations. In contrast, 401(k) plans and other retirement options are infamous for hidden fees, excessive costs and needless complexity. The industry has taken a lot of flak from policy makers and investor advocates for those high costs, and comparisons with state-based plans will only intensify the unwanted scrutiny."
https://mobile.nytimes.com/2017/02/14/opinion/whod-want-to-limit-retirement-plans-house-republicans.html