Orin nano power design

I’m designing a custom board for orin nano 8gb,and there are three questions.
First,must I follow the Power Up Sequence ?Is there any problem if I float the SHUTDOWN_REQ(PIN233)?
Second, must I follow the delay?

Is there any problem if no the two delay,or shorter?
Third,is there any problem if no Power Down circuit? Whether hot swap is supported?

Appreciate for any help.

Hi, please follow DG well. No other suggestions than that in DG.

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