I don't understand much about the 401K system, but it seems open for massive corruption and massively out of touch with the realities of modern working life if it's your employer that chooses your 401K provider or if you're locked into a provider once you choose. Surely I must be mistaken.
I am an owner so I have a say so to speak, but I am only one of 7 and in the minority concerning attitudes towards investing.
I am not 100% sure if I am "locked in", but functionally it is very tedious to switch and risky if messed up (penalties and such).