If you’re including text in your design, it’s likely that you have something important to communicate. Readability becomes an important quality to look for in a font to make sure your message comes across. How can you tell whether a typeface is readable, other than your own visual assessment?
I agree that readability becomes an important quality to look for in a font. When reading this I immediately thought of butting a small bright font in front of a bright colored background. The message may get across but not have the same impact on the viewer because of its readability.