Power Supply Sequencing on MSX60xx Switches w/ 2 PWR Supplies

The manual for the MSX60xx switches state that there should be a delay of minimum 2 seconds between powering on the two PWR supplies

on switches with redundant PWR supplies. Why is this so ? Is this really important for the switch, or is it due to the inrush current of the PWR

supplies when switching on both simultaneously ? I have a SX6012F-2BFS switch.