So I worry that some posts are disingenuous.
That aside if you can install apps then there is no advantage of device over phone since a new app can add the feature.
This is why computers took off over the years. As you could install or write a new program, the computer could do more. https://en.wikipedia.org/wiki/Computer
This is true for your device and phone so there is no advantage.
Other than the fact that my Smart Home Device (Lenovo Smart Display) has an in-built speaker, does anybody know what else it can do that my Smartphone which still operates using Siri can't?