Designers have different strengths

These strengths should be applied to the right problems.

Design encompasses many things, including:

1. Visual design: typography, contrast, hierarchy, and the good ol’ does it look good? falls into this category. Are the details crisp or are they sloppy? 
2. Interaction design: is it easy and clear for a user to do X? Is the navigation system robust? Do transitions and animations feel satisfying and make the app feel more intuitive to use?
3. Product design: does the design successfully solve a problem? Is the thing that is designed useful? Does it have a clear vision? Does it contribute value?