Live TV - possible to simply watch a specific channel?

Sorry if this has come up before but I’ve done some quick searching and didn’t find anything.

Is it possible to simply tune to a given TV channel? If so, how? If not, why not?

I use a Roku, and the Web Client, and my Android. I can’t seem to figure out how to do that on any of them.

I get the whole “program guide” / “show/movie-based” approach, I do, but there are a lot of times one just wants to tune a certain channel, or, like, the guide is inadequate. Like, I know there’s a Rangers hockey game on tonight but I can’t figure out how to find it in the guide, even after re-scanning the channels and re-updating the guide data.

Nevermind, I finally located posts about this issue here and here.

Glad to hear a grid guide is coming, can’t understand why it wasn’t done in the first place even with patents, just seems like an idiotic decision to me, but at least Plex is listening to customers for a change…