Was Cuneiform Originally Sumerian? Linguistic doubts about the world's oldest writing

The first written texts are in cuneiform, but in which language? Why do some specialists doubt these signs represented Sumerian? My sources: https://docs.google.com/document/d/10... Subscribe for more: https://www.youtube.com/subscription_... Patronize me per creation:   / nativlang   Tip me once: https://www.ko-fi.com/NativLang ~ Briefly ~ After trying to understand archaic cuneiform last time, I ended on a simple question: what language are these in? Well, after spending time in more academic books and papers, I'm back to share what I learned about the language of the old tablets. Sumerian? Euphratic? Unreadable in any (single) language? This is the third thing to come out of my "multilingual glyph" / "transglyphing" project. If, like me, you're into the polysemy of it all, be sure to watch the two videos leading up to this one. ~ Credits ~ Art, animation, narration and the few bits of music all by me. Full details in my sources document above