yeah, tried that, 1 minute? ridiculous for real time stuff (i.e. I turned on my TV now wait a minute+ for a screen saver to kick in and switch me to the app of my choice, -but understandable for a product that is billed as a screensaver. There needs to be a real auto-app launch capability that is instant.
Many Roku customers are trying to replace cable, cable does not come up and say, what main app do you want to watch so you can then select something to actually watch. An additional problem for YouTubeTV or many Apps is that even if it goes to 'Live' and last channel viewed within YouTube, it then imposes the dark overlay & guide instead of just immediately full screen showing what you last looked at (like cable or over-the-air tv does).- thus yet even more buttons to press before your normal go-to channel comes up.
That last part is not something for Roku to address, just the option to get you direct to an App of your choice if you want (i.e. a setting).