Only slightly related but why is 401k chosen by the employer in the US? In Australia your Superannuation (basically the same thing) is chosen and controlled by

Only slightly related but why is 401k chosen by the employer in the US? In Australia your Superannuation (basically the same thing) is chosen and controlled by you. After moving to the US it seems to be that each employer you have will give you a 401k plan with a different company and any time you leave you should roll it over to either another 401k or an IRA or something. Is it just me or does this make no sense?