I would suppose that there is just not enough clearance in the flutes for the chips to come up the flutes. A two flute can usually be made to do a decent job of 'drilling' a hole while plunging. Still the chips can occassionally weld into the flutes if lubrication is interrupted (in aluminum) and plug the tool. In deep slotting, it might be good practice to allow the tool to rapid up to clear itself before beginning the lateral movement.
The center cutting 4 flutes, IMO, are suitable for ramping in, not so good on the vertical plunge. A zigzag ramp, or a helical ramp or a boundary ramp are more desirable from a tool life point of view.
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