The risks are the same as any other time you avoid code reuse. Just off the top of the head:

• You're unnecessarily rewriting code which already exists
• The rewritten code will be duplicated in multiple places
• Different copies of the code may drift (scripts A and B get tweaked to add some behavior, but C and D languish with a bug that was fixed in F, while E, Q, and U get a completely different implementation of the same functionality)

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