> How it later grew into a general prohibition on mixing meat and dairy I have no idea though.
Oh I see, sorry. Yeah the generalized prohibition is older than cheeseburgers but I'm not sure by how much. I believe I have read about rabbis discussing it in the middle ages but I may have misunderstood. I don't know that much about rabbinical judaism frankly.
It’s at least 1400 years older than cheeseburgers
The rabbis wanted to be on the safe side, I guess.