That's rarely a productive question to ask.

It's just a slight variation on the totally unhelpful "Why don't you fix the bug yourself?" response that's sometimes given to people reporting a problem with an open source project.

They're useless questions because the answer is pretty much irrelevant.

Maybe he doesn't know how. Maybe he isn't qualified. Maybe he doesn't have the time. Maybe he doesn't have the money to fund somebody else doing it. Maybe he just doesn't want to.

It doesn't matter why he might not do it himself. But that in no way means he shouldn't publicly express such interest in such functionality, in case there is somebody else who is willing or interested in adding it.