When typing a new post or comment, I see that iOS sometimes autocorrects words but I never see the native autocorrect tooltips. Those are somehow disabled in the Openbook app. It would be better to leave those tooltips enabled so I can undo/ignore suggested autocorrections.

There's also another iOS-native feature that doesn't work properly in the Openbook app and that's the copy/paste feature, and the magnifying glass to move the cursor somewhere else.