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Fast role swap power architecture. USBC main buck/buck-boost choice

Alberto Gianelli1
Prodigy 40 points

Hi,

referring to Figure 6 of  "Fast role swap power architecture" paper, a buck converter is used to convert the USB-C Vbus input voltage (5-20V) down to 3V3, then the voltage is boosted up again to create 5V rail.

I am working on a similar scenario and I am wondering: wouldn't it be better to use a buck-boost to go from 5-20V to 5V and then buck down to 3v3? Is there any specific reason behind this choice? 

Thank you.

Alberto