ITT: People who don't know as much as me.
All they killed was the branding. The Chromecast with Google TV was such a far cry from an OG Chromecast that it was stupid for them to have the same name.
OG Chromecast could only cast and did not have a remote. The CCwGT did still support casting, but also had a remote and a real UI.
The TV streamer is just the CCwGT in a fancy shell with probably a more powerful processor. I'll bet money that it still supports casting, and can only do pretty much exactly what the CCwGT could do.
The Wind