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(b) is useful. (a) is (in intellectual fields) impossible to know. One of many reasons for focusing on fun rather than prophecy.
I think (a) can be useful when someone's potential is opaque to them. I've known so many people who think they "shouldn't" be interested in something (usually because it's low status among their friends). Eg a physicist friend just loved putting on a show, theatre, & explaining
physics. But he was a bit embarrassed by all this. We talked a _lot_ about it, and I think I (and many others) helped him gradually realize that these were things to be proud of, and build on, not embarrassed by. He now works as a science communicator.
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