The median 401k balance is downright scary. For ages 55-64, it's only $84k. Percentage participating in these plans doesn't mean much if they don't have much in it.
https://www.personalcapital.com/blog/retirement-planning/ave...
https://www.personalcapital.com/blog/retirement-planning/ave...
In the USA 401(k)[0] & 403(b)[1] plans are used by vast majority of people as their retirement funds. It is very rare for a small organizations to be able to offer full pension plans. What they do offer are investment plans like 401 & 403.
All those little 401k/403b plans, through the plans and the mutual funds are the "they" "shareholders", "getting rich".
In 2019 21% of US workers participated in pension plans, while 43% in 401K/403b [2]
[0]: https://en.wikipedia.org/wiki/401(k)
[1]: https://en.wikipedia.org/wiki/403(b)
[2]: https://www.pensionrights.org/resources/information-center/