Local paths can improve responsiveness
Removing an Internet round trip can reduce latency for supported functions.
Cloud services can add features
Remote access, voice services, analytics or video storage often use cloud infrastructure.
Hybrid systems are common
A device may support local Matter control while also using the manufacturer's cloud for firmware or advanced features.
Offline behaviour should be tested
Do not assume 'local' means every feature works with the Internet disconnected.
Keep in mind. Compatibility is not permanent. Confirm the current manufacturer, platform and certification information before purchasing, resetting or migrating a device.