The focus in bronze layer is quick CDC and the ability to provide an historical archive of source (cold storage), data lineage, reprocessing if needed without rereading the data from the source system.

It is recommended that the datatypes and the structure of the table remain as is of the source system table so that re reading of data can happen at bronze layer instead of hitting source table again.

The bronze layer being delta will help with more control over version so that re processing is easier.