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LM5176-Q1: FET loss calculation question

Part Number: LM5176-Q1

Hi,

I have a question about loss calculation as follows.

When in buck mode,
Why is QL1 calculated only as conduction loss?
(Is QL1 calculated as conduction by replacing diode in buck mode?)
Shouldn't switching loss be considered?
It is an on/off device, but please explain the reason why switching is not considered.

When in Boost mode,
Why does QH2 only consider conduction loss?
(Is QH1 calculated as conduction by replacing diode in bosst mode?)
Shouldn't switching loss be considered?
It is an on/off device, but please explain the reason why switching is not considered.