Around this specific point, what is it you feel would be confusing? The UI already shows a bit of ‘history’. And almost every other TV guide I’ve used allows a certain amount of historical info.
In my mind, it’s a question of how far back to show. Currently it is set to be quite aggressively cropped to the nearest 30 mins or so. I’m just saying it should extend to show the start of all shows currently displayed on the guide.
A good analogy is the timeline when playing a video on a computer or phone. You can see the start, you can see the end and you can see a marker showing how far along the video you are. Eg:
What a timeline view like above doesn’t and shouldn’t ever do is obscure the start or end.
Now a guide is a bit more complex because there are lots of timelines going on with different start and end points. The ends are fine, we already are happy with the inconvenience (?!) of scrolling to the right to see what’s on later, or having to scroll (less happily) a very long way to the right to see what’s on tomorrow or at the weekend (and then the long scroll back again).
Being against the idea of scrolling is one thing and seems like a debate long since decided. We live in a world of UIs that require lots of scrolling.
Being able to scroll just a little way to the left to see the starts of the currently showing shows is a bit of a no brainer in the context of the above.
Once you have that, the progress bars for each show make sense spatially, and they would all align at the current time, so then what’s the point of them?