A business considering new software often frames the decision as buying a product or building one. There is a third possibility: use an existing product for the common work and build the connections or interface that make it fit.
The useful question is where the business genuinely needs a different way of working.
Separate requirements from habits
Some requirements are essential: a particular approval step, an access boundary, or a connection to an existing system. Others describe how people happen to work today. Reproducing every habit in custom software can preserve unnecessary complexity.
Start with the outcome and the constraints. Then test whether an existing product supports them without awkward workarounds. Do not assume a feature name means the workflow fits. Walk through realistic cases with the people who will use it.
Inspect the gap between products
Two tools may each satisfy their own requirements while leaving a costly handoff between them. Staff may still copy records, reconcile conflicting values, or search for the latest status.
A focused integration can sometimes address that gap better than replacing either tool. In other cases, product limitations make the connection too fragile or restrictive. The decision should be based on the actual workflow and supported interfaces, not on the appeal of a tidy architecture diagram.
Price the relationship, not only the license
A purchased product brings configuration, training, vendor dependence, and possible migration work. Custom software brings maintenance, documentation, testing, and ongoing technical ownership. Neither option makes those responsibilities disappear.
Ask how data can be exported, what happens when pricing or features change, and who can maintain the system if the original implementer is unavailable. For an AI-enabled feature, include review effort and model-related operating costs where applicable.
A good recommendation may be deliberately mixed: buy the commodity capability, connect the systems, and build the part that actually distinguishes the service.
Custom development is most persuasive when its purpose is specific. The case should explain what the business gains that it cannot reasonably obtain otherwise, and what responsibility it accepts in return.