Many functions in Blender are not binded with shortcuts on shortcut list, like for example: “Create Custom Orientation” - you can find it on a list via F3 menu, but you will not find it on keymap menu. Why?
Another case: Batch Rename in 2.81 (ALT-F2) - you just have to KNOW that it exist, it isn’t listed anywhere.
A COMPLETE MADNESS. But it can be resolved:
all possible shortcut actions should be listed in one place. ALL.
you should be able to search function by shortcut (type a shortcut to find what it is binded to)
you should have a warning window when you overwrite existing shortcut