An individual can farm out investments to a target date fund at Fidelity or wherever.
The argument/issue isn’t really that it’s hard for individuals to make investments relative to pensions but that many don’t. So we need to not make it an option and do it for them.
Sure, but they have no way of knowing that a target date fund is what they should be looking for, or which target date funds are good and which are high-fee scams (or rather, they have no way to know that high-fee is the thing to watch out for). The seemingly logical thing might be e.g. put everything in the fund with the biggest headline return number in the last year.