Must BRP collection be in person?

Hello,

Logistically it'd just be easier for me to collect my wife's BRP on her behalf...

Does anyone know if the BRP must be collected from the Post Office by the applicant, or can their partner collect it on  their behalf if they have the passport?

No, she has to do it in person.

There is provision if she is ill or disabled but not just for convenience.

If you can’t collect your BRP
You can nominate someone else to collect your BRP if you have a serious illness or disability that prevents you from collecting it.

The person you nominate must have one of the following:

a passport
an EU national identity card
a BRP
You can get someone to make the nomination for you, for example a legal representative, charity, employer, college or university.

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https://www.gov.uk/biometric-residence-permits/collect