That's a strange way to frame it. Every skill is useful in some context. As a parent, I think a more productive way to think about it is to ask whether teaching kids anything is in line with your values. For me, I'd prefer if my kids were well rounded from being exposed to many different things, so they can make informed decisions later in life. That means they have lego mindstorms, but if they say they like tennis or they spend time drawing sidescroller games and not twirling to nutcracker ballet videos, then so be it. For some parents, laser focusing on something might be considered preferable.