My prof gave me something interesting to think about yesterday. The Greek alphabet has been heavily modified to record a variety of languages. Obviously, the Cyrillic script is the most notorious example, but Coptic is also an enhancement of Greek, and even the Bactrians added a completely new letter to it. The Latin alphabet on the other hand was only ever enhanced by two letters of Greek origin (K and Y), both still in Roman times. Ever since, it remained the same except for the addition of diacritics in some languages, despite being even more defective than Greek.