ADRF5730 Power-up/Power-down Sequencing

Page 13 of the ADRF5730 device data sheet lists a power-up/power-down sequence.  I am trying to gauge the importance of this sequencing.  Is this presented only a recommendation or does the sequence, particularly the power-down sequence, absolutely need to be followed to prevent damage to the device?

If the power-down sequence must be followed, are there any specific timing requirements between the individual steps?  How close can they be?  Please advise.  Thank you.

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