It's almost always going to be cheaper for an employer to simply not offer the benefit. What is true is that, for better or worse, there are certain benefits that employers can offer that, for tax and other reasons such as group purchasing power, the employee often can't purchase themselves at the same after-tax cost as their employer.
Health benefits are (controversially) often like this. So are many types of disability, life insurance, etc. plans, in part because with individual buyers there's an adverse selection effect. (You're more likely to want disability insurance if you know you have a high possibility of becoming disabled--and may not even be able to buy it as an individual in many cases.)
So are 401-K plans.
To elaborate, in the US, money spent on employer-provided health insurance is not taxed, but those who pay health insurance premiums out-of-pocket must pay with after-tax dollars.
This is an improvement over the pre-ACA state of affairs in which many (perhaps most) individuals would not be able to buy insurance at all, but still it's a pretty bad deal for anyone who doesn't work for a big company.
Also, if you want to shift the tax burden for these benefits from employers to employees that should be reflected in a raise of both income and taxes for employees.
For that to work for things like disability insurance, you'd need the same sort of mandate that's so controversial with the US ACA. The system doesn't really work if you buy benefits like disability only if you see a particular need for them. The 20-somethings need to buy them too whether they want to or not--or the system doesn't work.
I'm not sure why 401-Ks are so tied to individual employers.
I think this position is a bit idealistic, since some level of State power is unavoidable and taxes will be levied whether or not we agree with them. (Unless you escape to a desert island)
So if the tax money is real and the consequences of not paying are real, then I expect something from the government in return!
(I do agree that State power needs to be kept in check.)
http://www.raikoth.net/libertarian.html#coordination_problem...
What bugs me is people on both sides who act like any given choice isn't valid (like presumably all the people downvoting you).