There are no free lunches. But do note that this is also factored in into AirBNB's/Google/FB/IBMs/Microsoft's compensation as well; They could have paid everyone more and let them save for themselves, but -- like healthcare -- factor it into the "employer's cost" of which "visible" salary+RSU+ISO+bonus is only a part (70-90% depending on many factors).
The main difference is that in the US it is optional, so only the well-to-do employers and only at good-enough-time do it -- so the expected costs are weighted by the probability they will do them (say, 30% - I'm sure they have a good idea) -- and they can bail out at the last second if conditions are unfavorable for them to do that.
In Europe the systems mostly mandate it. The difference is more striking with respect to pensions paid on retirement - they are "optional" for the employer in the sense that they could (and are) discharged in bankruptcy, meaning that after 40 years of employment, one bankruptcy event (we'll see many after the lockdown) is all it takes to deny those payments.
There are no free lunches, indeed - the cost of higher US salaries are unpredictable (and often unfavorable) future cash flows for employees -- and only in some industries are the salaries high enough to actually allow the employees to prepare for that.
edit: I've heard someone describe these forcefully-ensured severance and retirement funds as "denying one the ability to steal from their future selves". I think that's an apt description of what it is.