The reset ‘relevant’ inputs means that it resets inputs that are used in the workflow. You aren’t using the input in a workflow so it won’t reset. As a trick, you can use it to set a state, then reset the input and it should then clear out for you. Does that make sense?
Note: as a result from this setup I realized an unwanted side effect raised here. Namely, the use of the state of the input in the erase workflow causes the input and the button to be bound in both directions. So pressing enter on the input will trigger the erase button.
FYI… there is a loophole where you can copy an is focused condition from an element into a workflow. True, it’s not officially supported, so Bubble could fix the loophole at some point and break your functionality, but it’s still a thing.