Software configuration management (SCM) tools are essential in managing the complexities associated with large projects involving multiple modifications and frequent change requests. SCM tools help in version control, tracking changes, and ensuring that all team members are working with the correct versions of files. They also facilitate coordination among team members and maintain the integrity and traceability of the configuration items throughout the project lifecycle.

In contrast, simple projects with few files and little complexity may not require such extensive tools, and projects without security requirements or specified control may not justify the overhead of SCM tools.