>>696050
>not always write down what we would call vowels
Perhaps in ancient Egyptian vowels did not matter much. They could say a word (a syntagma, a sentence) with different vowels and it would mean the same.
Hungarian is like that. Since we have vowel harmony, we divide vowels into low and high pitch vowels, and only one group of them can feature in one word. In our old runic writing system we have letters for each vowel, but in common use they often left out those, sometimes just noting the first vowel of the word and that decided if the following ones have to be in the low or the high group. Furthermore couple of the consonants had two forms, one for low and one for high vowels, probably giving hint for the rest of the word.