kind of. You can search across all apps on roku, but there is no "dashboard" for all your current shows despite app.

Hasn't this been possible for years on whateverthatgooglethingiscalled?

(I genuinely thought it was still called Google TV so I was rather confused by this post - I couldn't work out what was new.)

It's also been on Apple TV and Amazon's Fire TV for a long while now. Agreed, it's not novel. However, maybe Google's recommendations are better? Google tends to have the best AIs.

I don't own a Roku, just a Chromecast

Except that Roku is playing games and you can't get an HBO Max app now.