Those who disparage "X for Y" descriptions misunderstand their use. When you have only a few minutes (or seconds) to pitch your idea, being X for Y or the X of Y is an effective way to give people the gist and pique their interest. Only then does it make sense to go into more detail and explain the full scope of your ambitions.
Exactly. Only a minority of companies that use those pitches used the same phrasing in their initial creation process. The goal is to solve a problem someone has, the "X for Y" is a shorthand for "don't take my word for it that people have this kind of problem, look at this very similar situation".
