Legibility is a baseline requirement for typesetting anything. It’s like edible food. It shouldn’t really be a measure of what is good or not. Just like audibility and comprehension are baseline requirements for speech. There is more flavour in words; spoken or printed. There is more flavour in type, that if applied well, transcends content from being merely legible, to that of being pleasurable. After all, that’s why we have different typefaces: each brings with it characteristics that flavour the words.