so instead of browsing /r/all, my mobile experience will consist of solely visiting the handful of niche subreddits i have favourited? thanks, I guess?

seriously this, it's dogshit if you only go to a few subreddits, even if they aren't favourited. I gues /r/random will have to do a lot of that heavy lifting now. It's going to be subreddit 50/50 - either you boring or great subreddits, or furry stuff.