If you already have a TV with which you can access the internet, but you want to operate it with Google Home, i.e. by voice command. Is it worth buying the Google Chromecast just for that?

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Chromecast is mainly worthwhile for 4K streaming via third-party applications. With internet-enabled TVs, you are always tied to the TV's own applications and the TV remote control. 
With Chromecast, you can stream anything you want from Android (& desktop Chrome). And this from any device in the WLAN. Whether music, pictures, videos, streams, screens, etc., you can do it all.

There is no yes/no answer to your question, but I would never want to go back to the time when the TV could still be operated on the TV (instead of via tablet/laptop/mobile phone). That's probably more a matter of taste ;-)

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Question about Google Chromecast Ultra EU Version

If you already have a TV with which you can access the internet, but you want to operate it with Google Home, i.e. by voice command. Is it worth buying the Google Chromecast just for that?