There are many reasons that the female ferrule is on the bottom on cane rods and the reasons mentioned are valid. Here are a couple more.

Traditionally, cane rods are often supplied with two tips. The metal ferrule halves must be hand fitted to each other by carefully abrading the male spigot until you have a nice slide fit with the female and fitting two males to the same female is much easier than vice versa.

Cost. The female is the heavier, longer part and providing two of them versus two males would be more expensive.