Yeah, good luck remembering to do that up-front for every event handler. You missed one? Whoops, enjoy the information you wanted silently not being there when you need it.
Remembering to do what? Properly maintain a list of constants and enums to use throughout my application?
That's not something I have to remember or forget, it's a simple habit that is as natural as importing and referencing a function.
As a general rule, numbers and string literals should never be hardcoded. Internalizing this should be a base expectation of any high-performing team member.
