Respectfully - not. We made some SMPS for power stations where reliability was critical. So the PF stage was ditched. The down converter ran off the rectified mains (per the old days). As the site of operation was a power station, a bit of peaky current draw was not a problem, but the increased reliability (half the bits and one only converter per psu) was a given, units up to 121.5VDC at 25A (paralleled outputs, 3ph + N supply) for 75amp DC supply, and 24V-50A, and 48V-40A units.
15 year operating life at full power, @25 degC ambient, operation to 40 degC, variable speed fan cooling above 50% Iout... alarms etc ...