There is a constant discussion if "doing from scratch" is good when a lot of historical and supporting materials are available.
Some say, that copy-cat of the successful project, including documentation (requirements, test plans) is good for new one.
The concern is that in case of copying of documentation and its almost automatic approval, than the real requirements are not identified. Also copy-cat does not allow the stakeholders to investigate the product and process with sufficient level of details.
Contra argument is that proper product already contains features of best-on-the-market, and superior-for-business features. And requirements of the particular organization might be much worse than build-in features of the product. Example is SAP that does not allow much to change in its pre-configured business processes.
Anyway, Know Your Business is crucial success criteria. Vote for "Do from scratch, can read, but No Copy-Paste"!
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