I use it to mount iPhone as a FUSE filesystem in order to download photos using rsync.
I'm an Android user, but that just seems like basic table stakes…?
Let’s just say this: Apple took the time to create a whole different interface for the TRRS headphone jack just so they could have buttons on the headphone cable. Then when app developers thought it was awesome to be able to use that button as a trigger while the app was in the foreground, Apple stopped them by removing their App store listing until the dev submitted a version without that feature. Same with detecting touch size (to ingeniously determine touch pressure).