Earlier quoted context omitted.
In a given person's life, there might be plenty of reasons why they can't be one or the other, but that's just me being a pedant. However, as I see it you can choose to invest time and resources into being 'useful' or 'interesting', but the one will usually divert said time and resources away from the other. E.g. you can do deep science, and help the scientific progress of humankind, or you can be 'interesting' like…
You're talking about fame. I wasn't; I took "interesting" to mean "not boring".
Recognition of one's work is a lot of the time a function of how 'not boring' you are, as well. Thus, if you do excellent work but don't advertise it, the next promotion will very likely not go to you.
This is, IMO, an inherent weakness in how humans perceive the world and I'm not looking for a fix, just a way to cope with it, since the injustice of it all sometimes really gets me down.