In my experience, big contracts and companies often require documented and standardized solutions so the project can be maintained, improved, and fixed easily at any point in its lifetime. No one knows how long a software project will be around, and they know you won't be around forever (they don't want you to, as that would mean spending more money). There is of course a considerable amount of customized work to be done, but using public or private/paid solutions that are easily available and that anyone can pick up is a common practice.
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In my experience, big contracts and companies often require documented and standardized solutions so the project can be maintained, improved, and fixed easily at any point in its lifetime. No one knows how long a software project will be around, and they know you won't be around forever (they don't want you to, as that would mean spending more money). There is of course a considerable amount of customized work to be done, but using public or private/paid solutions that are easily available and that anyone can pick up is a common practice.