Software development is not about documentation. Software development is about creating software solutions that help customers perform their work. Process improvement is not about documentation. Process improvement is about fixing chronic problems in the organization and capturing the solutions for reuse and refinement on the next project.
Overkill and overweight documentation is often the result of poor clarity of purpose and inadequate understanding of how each document should be used.
When documents are written with a clear business goal and need in mind, they become important and useful.