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Google is discontinuing the Chromecast line
(www.theverge.com)
This is a most excellent place for technology news and articles.
Most of the appeal of the Chromecast is that it's a dongle you plug in once and never have to see again. It doesn't need high performance and 32 gigs of RAM. It needs to play video. That's its entire purpose. It's controlled by any phone on your wifi, it doesn't need a remote.
For most users, this is an expensive downgrade.
The remote was the biggest upgrade for me on the Ultra though. I always struggled to find my phone and do stuff on it just to watch some YouTube or Netflix videos. And the Kids don't even have a phone and they want to watch on the TV in the livingroom too sometimes. With the remote it's easy for everyone to use it without fiddling with the Phone.
My parents have the one without the remote and they basically never use it because my mom doesn't have a mobile phone and my dad newer has it with him, it's always not charged or in some other room.
Or you can use it's remote and not need to use your phone for absolutely every little thing.