I think I realized what's doing it. I'd like to be able to separate original posts and replies into separate feeds
Discussion
I’ve found that you can tap the little Nostur icon at the top to scroll on the way to the top. And if you long press on the “Following” feed you have the option to view or hide replies. 
Looks like I have to keep toggling "hide replies" off again when I return to the app. I think Damus' approach with a Posts feed next to a Posts & Replies feed is my favorite approach.