as a rule creator I want to have an option to download an excel grid based on the columns in a guided decision table and have the business fill this using excel and afterwards upload the filled excel as rows in the guided decision table.

reasoning:
for large mapping tables it would be nice to create the structure of the decision table in business central
then get this structure into excel tables
then give the business the excel
after the business has filled in the values
and after validation of the values by IT
we import these values as rows in the table.

this is common practice for the initial upload of data in a new system.
all changes afterwards will happen via business central webapp
I know this bypasses data entry validation and should be used with care,
though if implemented decently, mass upload data validation can be still be enforced during import.