Couldn't the same be said of any invention? There have been very few eureka moments in human history. Most inventions were tiny incremental evolutionary changes in other things that preceded them until they finally reached a tipping point to become useful. The ideas behind the printing press were in use for more than 1000 years before Gutenburg. His was the evolutionary change that was viewed as the most important, but there were a long line of evolutionary changes all leading in the same direction.
Yes, but like electricity and math, it could be argued that Language was actually a pre-existing phenomenon that was discovered, or even described more than it was created
https://en.wikipedia.org/wiki/Evolutionary_linguistics
We didn't invent fire or evolution, we just learned how to control and describe concepts that existed long before humanity. Such is, quite possibly, the same with language.
After all, lesser creatures had means of communicating among themselves, and even transmitting information to others, long before humans were around, and they still do.
along the lines of Gutenburg and the Printing Press, the Steam Engine was first created, described, and displayed in ancient Greece, ....just a few thousands of years before Watt, or whoever it was is credited with it.