Most teams should use off-the-shelf software, and we will say so when it is the right answer. Purpose-built earns its cost in a narrow case: when the workflow you actually run cannot be expressed in a general tool without distorting it, and the distortion is what creates your risk. Compliance workflows tend to land there, because the rule you must satisfy is specific to your program and changes on someone else's schedule. If a generic tool covers you, that is a better outcome and a cheaper one. The question worth asking first is which situation you are in.