They did not have the benefit of cheap, off the shelf, mass produced batteries. Bronze is a relatively hard alloy of copper and tin, better suited for the purpose than the much softer copper enabling improved durability of the weapons and the ability to hold a cutting edge.
For many years the telegraph, and later the telephone, industries were the only consumers of batteries in modest volumes and it wasn't until the twentieth century that new applications created the demand that made the battery a commodity item. The use of bronze for tools and weapons gradually spread to the rest of the World until it was eventually superceded by the much harder iron.
The archaeological evidence of local Canaanite, rather than Egyptian, origins of the kingdoms of Judah and Israel is "overwhelming," and leaves "no room for an Exodus from Egypt or a 40‐year pilgrimage through the Sinai wilderness." The culture of the earliest Israelite settlements is Canaanite, their cult objects are of the Canaanite god El, the pottery is in the local Canaanite tradition, and the alphabet is early Canaanite.
As the perpetually single friend, I often find myself the third wheel, or even the fifth wheel, on group outings.
A detailed examination of the innumerable issues raised by the fringe Velikovsky and Rohl alternate chronologies is beyond the scope of this article, and will not be attempted here.