Why Not Only Copilot?

Microsoft Copilot is excellent inside Microsoft 365: meetings, email, documents, and SharePoint knowledge. If your work lives in Office files, Copilot should be in the plan — and it is.

But Copilot alone leaves gaps:

• It cannot become your field-service reporting system. Structured intake, photos, job codes, and approval workflows need purpose-built software.
• It does not ground answers in your controlled document set with citations. A knowledge assistant needs retrieval limited to approved sources, with visible references and refusal when sources are missing.
• It is not suitable for restricted data workflows. Export-controlled or customer-controlled information needs local or isolated processing — which is where locally hosted models fit.
• It does not integrate with shop-floor or line-of-business systems without additional Power Platform or custom work, which should be scoped honestly as implementation effort.

The right pattern is routing: use each platform where it is strongest, governed by data sensitivity.