I want to know the answer to the following question:
What distinguishes Latin, Greek, and Cyrillic from one another?
All the background I'm provided with is that "Without letter case, a "unified European alphabet" – such as ABБCГDΔΕZЄЗFΦGHIИJ…Z, with an appropriate subset for each language – is feasible; but considering letter case, it becomes very clear that these alphabets are rather distinct sets of symbols.". Is that enough to answer the question?
Answer: yes