Every record has a System Record ID but not all records have to have a Constituent ID. For example, Relationships that are not constituents do not have Constituent IDs, if we had the System Record ID in a separate column, we could type that ID into a query and find who that Relationship is connected to.
I would like to be able to add other columns as well. Constituency code or class years are the only way we can tell people apart in a setting where we have a lot of legacy names.