When I had a phone with a jack, I used it daily to listen to podcasts or music during my commute. Now, without a jack, I use a converter daily to listen to podcasts and music during my commute, but can no longer charge my phone and listen at the same time.
It varies per game, but my most common use is to replace the thumbstick clicks. I don’t like how it feels to click in the thumb sticks, feels like I’m adding extra wear and tear to them.
In first person games, I’ll often bind jump, sprint, reload, and melee to the back buttons so I can move and aim while performing those actions.