Thanks for the clarification.
It means, as I understand it, that the in-game Tech of Writing needs the same kind of Tech - Application system I've been hypothesizing for the rest of the Tech Tree: a basic discovery , which in this case might be called Record Keeping: a combination of numerical notation of some kind and an ever-increasing collection of mnemonic notes to indicate what is being counted/recorded, which leads to Applications which are more specific Writing technologies. I'll leave it to you, being more expert in this, to give us a suggested list of 2 - 4 Most Basic systems, because I think that is the range of Applications that should be applied to each Basic Technology. I'd add the proviso that once a writing system is adopted, it is very difficult to change without Outside Influence or some new social, civic, or technological development.
This seems to be exactly how it works: people start making pictograms and marks as a reminder "the temple has ten sheep and fifteen cows"; gradually this mnemonic proto-writing starts to get generalized to formulate more complex ideas, at which point you have logograms; over time you need an abstract word A that sounds like concrete word B (or B + C), at which point you have the acrophonic principle where logograms are applied for their sound rather than their meaning, at which point you are just a hair's breadth away from a syllabary (worth noting that
all known logographic systems--Egyptian hieroglyphs, Mesopotamian cuneiform, Chinese script, Mayan syllabic script--use acrophonic glyphs alongside logograms). So if we want to expand the Writing tech I might suggest something like this:
...........................................................................Mass Literacy (Phonetic Script)
........................................................................../
Record Keeping => Logograms => Acrophony
..........................................................................\
...........................................................................Professional Scribes (Advanced Logograms)
Logographic scripts require a professional scribal tradition, which 9 times out of 10 will be connected to the temples (the 1 instance out of 10 is, of course, the Chinese civil service...). This promotes the existence of a highly educated, highly intelligent, and often secretive elite group of scribes who likely wield extraordinary power. In China, this "class" drew from middle as well as upper classes, and in Egypt it was open to women. The advantage is that it keeps the "rabble" from having dangerous ideas, and it also promotes the development of a highly sophisticated if somewhat inaccessible cultural tradition. By contrast, alphabets and abjads allow much higher literacy rates (as happened among Jews and in Greece), allowing more people to participate in the intellectual life of the society and the cost of the kind of "received tradition" that accompanies professional scribes. Incidentally, this can also allow bold ideas to spread like wildfire: the high rate of Greek literacy in Rome was a major contributor to the spread of Christianity, for instance. (These two ideas are not completely exclusive: e.g., most Western European societies in the Middle Ages had the Latin alphabet but also professional scribes, i.e., monks.) I wouldn't tie Calligraphy specifically to the choice of script. I think of the rich tradition of calligraphy in Arabic, for instance, as a result of Islam's aniconism.