The KO is irrelevant in most games because you're playing a GX deck, you can play a 7 prize game with it.
Keep in mind that fisherman and other late game recovery supports get harder to use in a meta without vs seeker. You'll often end up discarding it early or end up running through your Leles, which are your only way to pull it on demand.
Good Point! Still feel like that 1 non GX/EX knockout could be something more useful though. Just make sure you have VS seeker in your deck.