Why is document control still painful in most plants?
Because documents live in shared drives, approvals live in email and the forms people fill in live on paper. Nobody can say for sure which revision is current or who was told about it. The Document Control suite keeps controlled files, change approvals, forms and search in one system with one set of permissions.
Each product handles one job. Together they keep the current revision in front of the people who need it, capture the records your procedures ask for and let anyone find what a document says.