When I was a beginner in futures trading in the late 70's and early 80's it was the money supply, M1 & M2.
I was actively trading for myself and mainly Gold, Silver, Copper, the DM and CHF in those early years.
Our Fridays nights (23:00 local) were spoiled as we were waiting in agony with fellow traders to read the money supply
numbers from a Reuters tape printer in the Athens Branch of Merrill Lynch.
A few years later it became obsolete, a non-event. Then the CPI report I think became the plat du jour next.
Now it is Fed talk that seems to matter most, practically to the whole world. It financially affects billions of people.
My FF is that in a few years time, it will become irrelevant as well. Perhaps there will be no Fed in the future.