Honestly, many times. A common occurrence is singular evolves to multiple: "the touch position" becomes "the touch positions," "selected item" becomes "selected

Honestly, many times. A common occurrence is singular evolves to multiple: "the touch position" becomes "the touch positions," "selected item" becomes "selected items", etc. The backing storage switches from T to [T]. In this scenario it's easy to make the old method do something sensible like "return the first item." But maintaining an old field is more difficult: you can't make it lazy, you can't eliminate its backing storage, etc.