As useful as proposal content libraries are for knowledge management, cutting and pasting from them can be problematic. For example, if your library content has been built to answer a standard question that has been asked in a certain way - like "describe your quality process" - it will go only part-way to addressing a more specific question that asks you to "describe how your quality process will achieve zero defects and manage risks in achieving budget and schedule".
That's where your specialist knowledge is needed to turn the description (of the quality process) into persuasion (how this will deliver something that's meaningful to the project and the customer).