Several designers have told me how important it is to have a specific use and point size in mind. The idea is that if you try and design a font that’s good for everything, it might not be REALLY good at anything. But if the font works really well for one specific use, then it can probably work well for lots of others. I’ve heard the example of J.K. Rowling writing her books for her daughter. If she tried to write books that everyone would like, they might be too general to connect with anyone.