Off-the-shelf software is often the right answer.
If a mature product solves the problem well and the workflow is standard, buying can be faster and less expensive than building.
Custom software becomes useful when the workflow matters.
When multiple tools create friction, key processes are unique, data needs to move differently, or the software itself is part of the product, a custom system may make more sense.
The decision should come from process, ownership, integration, scale and long-term cost—not from a preference for custom development.