The point is not that you can't cut みません into み and ません. The point is that it should be one single gap in the first place. It's like cutting gaps out of Englis

The point is not that you can't cut みません into み and ません. The point is that it should be one single gap in the first place. It's like cutting gaps out of English sentence like this: I'm [go][ing] to beat the shit out of that guy. Sure we know the logical way to break down 'going' is 'go' and '-ing', but it should be one single gap anyway.