Comment by jb1991

The thing is, it’s not actually effortless in many situations to switch from one map to the other. In C++, if you switch to an unordered map, you now have to contend with the annoying boilerplate of implementing a hash function for many key types. Using an ordered map may sometimes give you a slight hit in performance, but it offers significant benefits in developer convenience, and for small maps, the binary tree could actually be faster anyway.