YouTube TV App - Basic Features Missing?

We recently switched over to YouTube TV and have been really frustrated with the app. The root of the issue is I can’t seem to find any sort guide or instructions for how to do basic things, but when I search for specific things, it seems like a ton of basic features/functions are non-existent. What am I missing here? Is the “500lb gorilla” in streaming app really this bad?

A few examples:
-Jump to last channel - I can actually find info on this and it doesn’t seem to exist. There is the “click down 3 times and it should be there” workaround, but this very rarely has the last channel as the first choice, which makes jumping between 2 games a chore.
-Catch up to live - can’t find any information on this. Most services have a “go live” button if you pause a show/game and want to quickly catch up; it seems YouTube TV does not. I can fast forward and hope I’m live, but the best way seems to be to switch channels and then come back.
-DVR/Library - my wife is the one that uses the dvr, but it seems like a complete disaster. If she stops a show in the middle, there is no way to resume where she left off? So she has resorted to writing down where she stopped. Likewise, there is no way to tell what episodes she has watched (and you can’t delete single episodes after finishing ), so again she has to manually track it?

As mentioned above, on top of the issues there seems to be basically zero official guides or instructions on how to use the damn app so I’ve come here to see if I’m just completely missing something. Appreciate any pointers as its extremely frustrating that I’m missing Xfinity already. I’m using the fire stick and LG smart TV apps if they matters.