Final answer:
Right joins are underutilized because they are mirror images of left joins and can be replaced by them simply by switching the order of the tables. Left joins are preferred for their consistency and readability in SQL queries.
Step-by-step explanation:
The question pertains to why right joins are not as commonly used as left joins in SQL or database-related operations. One reason right joins are underutilized relative to its input numbers is that they are essentially the mirror image of left joins. That means anything that can be done with a right join can also be accomplished with a left join by simply switching the order of the tables involved in the join.
When conducting joins in SQL, the left join is typically used because it includes all records from the 'left' table, and the matched records from the 'right' table, or NULL in case of no matching join predicate. Since the same effect can be achieved with a left join, many database users and administrators stick to using left joins for consistency and readability within their SQL queries, reducing the need to use right joins.