1) Reading assistance for people with sight impairment. Reddit has granted a pass for some apps on this basis though.
2) Moderation and Modmail. For people on the move, or, for example, where you're in front of a business PC or laptop all day, with Web restrictions or personal use policies. The mobile apps were extremely useful for moderation.
I did use the Boost app, but have moved to the official Reddit one for mod work; it's buggy and prone to erroring when trying to complete an action so you have to keep repeating things to make them 'stick'.
This is why the mods are up in arms because it's hard work at the best of times.
