[addicted44]

There's also apps you just want for the integration they may provide (for example, a keyboard app) but don't want to install the entire app.

I have the Pocket app installed on my iPhone, because I want to be able to share stuff to Pocket, but I don't ever actually use the Pocket app to read stuff.

Then there are utility apps, such as the app that I used to setup my wifi, that I rarely open but still want to keep around in case something goes wrong.

There's all sorts of reasons to have apps installed but not showing in the most prime real estate in the world.