Choice component in a form write to a relation column

Just wondering what are the benefits of writing a choice component in a form directly into a relation column?
Instead of writing into the basic column (ID) and then the computed column relation will return the related row

Mostly I think it’s to benefit Airtable users so they can can write to Airtable linked record columns. I haven’t really understood any reason why you would want to write to normal relation columns.

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