Because we're humans, not robots and a human manager with human managees should be capable of working within a process without abusing the most obvious of edge cases.

When building software you have to be precise to the nth degree but with human processes you can afford some degree of ambiguity and judgment...

If you are measuring tickets, then you can't.

Your job is to create tickets to close them. If you generate productivity along side that, then thats a bonus.