Input protection: DC Jack Power Connections

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
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What is the purpose of the DC Jack Power Connections PMOS circuitry? I had initially thought it was a reverse polarity protection, but simulation result show otherwise (circuit on top is reverse polarity protection, on bottom is referenced from P3737)

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Can I omit the circuitry? I am using 48V input to the board which is converted to 12V for HV.

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It is a switch to have a delay before turning on and make VCC_DCIN more stable when plug in.

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