I agree, and the same should be true for health insurance, gym memberships, etc.
However, in a practical sense, your point doesn’t matter because all retirement plans accessible to the majority of people are employer-based. Most people only get access to 401(k) plans through an employer, and the only reason it’s worthwhile for them is for the employer match (asset growth won’t be meaningful, particularly compared with inflation).
Often there are also vesting issues as well. I worked for a company once where if your tenure at the company was less than 4 years, the company got all of its contributions back. Many other employers offer no matching whatsoever, and in that case you really have to ask yourself whether it wouldn’t be better to instead pay taxes up front and just invest retail into some low-fee broad-market ETF on your own, rather than to trap money away behind penalties and tax complexity in a 401(k) where you’re not even getting a company match.
So we are still equally reliant on employers as the facilitator of access to a retirement benefit. Functionally it’s truly not different than pensions, only the underlying financial instrument is different.
You do point out that depending on an employer for retirement is a bad idea, but in the absence of greatly expanded social security and nationalized health care, depending on an employer who at least has the chance to use its scale to mitigate risk in the retirement instrument is about the best you can do.
Expecting individuals with little or no access to meaningful financial planning services to manage the risk profile of their own retirement vehicle is ludicrously stupid by comparison. Individuals can be wiped out by unexpected legal bills, insurance technicalities, early death of a provider, etc. Infividuals are not the right level of entity to be juggling these risks.
Instead it points to a moral failure on the part of corporations, forsaking loyal workers in favor of complex strategies to extract labor without being compelled to absorb the risk of retirement financial solvency.