Big and well funded employers love the competitive advantage of having lower per employee administrative costs over smaller employers.
This was sort of fixed at the end of 2016 by allowing all employers to reimburse employees for employee purchased health insurance with pre tax income.
Employers also love obfuscating labor prices so it makes it more difficult for employees to compare wages from employer to employer (although paystubs and box 12 code dd of w-2 does show you the price of the health insurance you are getting, but you usually do not have access to this information when deciding on a job offer).
- The cost of government provided healthcare does not match dollar for dollar or below private health insurance
- There is no value add from a supplemental policy