I agree, readability can be tested. I am attempting to claim that readability is not the key factor. There have been font readability studies; but if designers

I agree, readability can be tested. I am attempting to claim that readability is not the key factor. There have been font readability studies; but if designers were to follow them, all work would be black-on-white-large-x-height-minimal-serif-double-space-60-character-lines. I am advocating seeing font as a tool designers use, not an end-user product. When I choose to develop a program using lisp instead of python (or vice-versa), I pick based on preference, knowing that I can produce a competant program with either --- though those programs will certainly differ somewhat --- not because of end-user useability studies of programs created with each. I believe that equally readable, memorable, aesthetically pleasing design can be produced with either font; they are, after all, very similar. Designers find one more pleasant to use.