How true is that these days? Sure, old-school pension funds are managed without any input from the future pensioners, but most 401ks (and similar) these days have a variety of investment options that the employee can choose from. Yes, there are some that have extremely limited options, but I'm not sure how common those are.

And once you've left the company and roll those 401ks over into IRAs, you can put them at whatever financial institution you want, many of which have more or less unlimited flexibility (within legality) with regard to what you can invest in.

Now, I know many employees just sort of adopt an "autopilot" attitude and don't pay much attention to their retirement account investments, but that's on them for ignoring this stuff. (The lack of general financial literacy, in the US at least, continues to disappoint me.)

So: yes, there are some people who don't have much of a say in how their retirement fund is invested, but my feeling is that those people are a small minority. I do think a large number (perhaps even a majority) of people do have the ability to direct their retirement investments, but either don't know they can do it, or can't be bothered. Again, though, that's on them for not educating themselves and playing a more active role in their financial future.