Yes, I agree that there should be no tax benefits for employer's providing matching contributions to retirement accounts they can restrict investment options for.

I recently hit this up in Canada with a matched group RRSP which has a heavily restricted panel of options for investment and while contributions are matched and the transfer fees aren't too steep they are there and intended to capture clients within their spread of options.

I would prefer if group retirement plans had more flexibility on in/out flow and had to legitimately compete with the open market.