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Google's 'high-end' TV Streamer isn't a 'Pro' device, and that's okay
Pro devices exist and this isn't one of them.
In this case, I think the company made the right decision because almost nobody reading this will set up a Plex server or turn a streaming box into a game console. The somewhat new Chromecast with Google TV HD is just $30, and that's a steal if you want something to plug in, hook up to Wi-Fi, and just watch "stuff." In addition, Google added some cool stuff, like a home control panel and support for Thread and Matter.
Or read this on Android Central