I think the range field is the only one that is not able to be erased / reset once the slider moved.
My use-case : I have a non-required range slider to set a page-related threshold. When the slider is empty, the threshold is disabled. So I’d like to be able to empty the field from the panel.
When the range field is focused, I suggest listening for backspace key press to set an empty value if the field ain’t required.