The document discusses issues with using the Comprehensive Perl Archive Network (CPAN) for application development as CPAN modules change frequently, making it difficult to consistently build the same application. It introduces Pinto as a solution that allows creating private, immutable versions of CPAN to ensure applications are always built the same way. Pinto also allows storing custom modules, forking CPAN versions for experimentation, and reverting changes to maintain consistency when building applications.