The iOS app UI seems too error-prone when it comes to gear editing.
When opening the gear list and tapping any item, the most prominent button on the screen is Retire.
Similarly, when on the gear’s edit screen, the prominent/main/most visible button is Delete at the bottom of the screen. On the contrary, the “Save” option is non-intuitively in the top-right corner, won’t catch the eye for the first glance, and if you’re on this screen for the first time, it might take a while to even find it (that was my own experience).
In both cases, it’s too easy to accidentally delete/retire gear.
The best practice would rather be that the prominent/main button actually confirms/submits any changes on the screen (just like it is in this “idea submission” form, to use an easy example).