The Google Home, Apple Home, and Alexa apps tend to offer a simplified set of controls for most devices, so it might be good to keep the third-party app around just in case you need to access particular settings.
After setting up a device and linking it to your chosen ecosystem, you may not have to use the third-party app again, but this varies depending on the gadget. The Google Home, Apple Home, and Alexa apps tend to offer a simplified set of controls for most devices, so it might be good to keep the third-party app around just in case you need to access particular settings.