I understand that after you leave employment of a company with a 401K plan in which you participate, you can move that 401K into a rollover IRA. Is there any "backdoor" provision that would let you periodically seize funds in a 401K plan while you are still employed?
The issue is flexibility of investments. Rollover 401Ks at a brokerage are typically very flexible and allow investment in individual stocks, foreign ordinary shares, and individual corporate bonds. 401K investments tend to be very restrictive.
The 401K advisor and fudiciary have zero incentive to assist with getting funds out of a 401K. Obviously they are paid fees based on the amount of funds under management, so I am not expecting that they would make it easy to take control of those funds.