With most 401k plans, you can choose what you invest in to an extent. You can put it in bonds or other investments if you want.
Target funds are diversely managed. This isn’t a real concern.
If you're good with that, I'll send you my PayPal so you can get me my 5 bucks. It's a tiny fraction of your overall cash flow, whats the big deal?
But there are many funds that have different strategies, both passive and active. Such as by investing based on value, quality, dividends, etc.
I get that the average person doesn’t know this, but the 401k doesn’t inherently force somebody into broad market funds.
I think the main problem with the 401k is that not enough people actually contribute to one. Or they don’t put in enough.
But I very much doubt the average person who’d invested enough over several decades in a 401k feels like they got fleeced.