I guess it is a little disappointing, at first. But, as a parent, you learn to embrace your children’s interests and help them in the direction they choose to go.

Although you can force and manipulate them into doing things (and, sometimes it makes sense to do so), at a certain point one realizes that motivation is very personal. That is, you can setup the environment to encourage interest. But, if there’s still no interest, even incidental, the outcomes won’t match the expectations.

For a silly example, imagine a parent with a passion for collecting dust. They try every trick to make their children also enjoy it. But, whatever they try, the kids would rather play baseball. What does the parent do? They can make everyone miserable by continuing to force dust into every aspect of life. Or, they can learn to enjoy baseball.

Fortunately, a very curious parent can easily learn to enjoy things that they normally wouldn’t enjoy.

I realize I wasn't clear as didn't meant "isn't it disappointing to be unable to share a specific thing" but more "isn't it disappointing to see your children having a narrower field of interest/curiosity than yourself" (which I also can see happen in your example btw, you're able to enjoy basketball yet they still don't get dust the slightest)