Well as i said before;

Think about it like this. Runes were used by many tribes regardless of ethnicy. There were differences but these differences were like for example comparing French latin script with Slovak latin script. There werent any fundementaly different runes.

I think that generaly our ancestors didnt need runes alot. Our ancestors were mostly free farmers and craftsmen. Sure they had communal gatherings but i doubt that deals made in such gatherings were very complex in nature. They had alot more important things in their mind like for example working in the fields and fighting enemies or stealing from enemy.